---
title: "Specific Cost | GTX Products"
slug: "specific-cost-products-1"
description: "Learn about Specific Cost Products in Marlin GTX trusted automotive software by Megabus."
updated: 2026-06-14T23:56:25Z
published: 2026-06-14T23:56:25Z
canonical: "help.megabus.com.au/specific-cost-products-1"
---
> ## Documentation Index
> Fetch the complete documentation index at: https://help.megabus.com.au/llms.txt
> Use this file to discover all available pages before exploring further.
# Specific Cost Products
{{variable.GTX Bold}} enables businesses to manage made to order or non-standard products by grouping individually purchased items under a single specific cost groupings.
**Specific cost** groupings stand in for kinds of products that may be ordered as required, rather than keeping specific models on hand (eg. brakes, engine parts, batteries, etc.).
The **broad product grouping** is first added as a "specific cost product".
**Specific products** can then be added to the grouping by adding them to a **[Supplier Purchase Order](/gtx/docs/purchase-orders)** or during [Stocktakes](/gtx/docs/specific-cost-products-1#stocktakes) and [Journal Entries](/gtx/docs/specific-cost-products-1#journals).
## Adding Specific Cost Groupings
Specific cost items can be added by selecting **Specific Cost** from the **Costing method** drop down, when adding a product in Product Maintenance.
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The rest of the product information can be filled in as usual.
Specific products can then be added to the grouping by adding them to a **Supplier Purchase Order**.
>default cost/prices can be entered? Otherwise, leave blank
>>The price fields (except Avg Cost) can be edited whenever as long as it's a locally maintained field. You can change the price on a PO on the spot, but that won't affect the default price you've set up in Product Maint.
### Items Tab
Specific products that are currently in stock can be viewed by opening the specific cost grouping in product maintenance and clicking on the **Items** tab at the top.
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Once a specific product has been sold, it will be automatically removed from the list.
## Purchasing Specific Cost Products
Specific products can be added to specific cost groupings by adding them to a **Supplier Purchase Order**.
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**To add a specific cost product:**
* Select the product grouping using the **Product** picker
* Enter the specific name of the product in the **Description** field
* Enter the **Quantity** being ordered
* Enter the **Cost** of the specific product
:::(Warning) (Tip)
Specific Cost product descriptions can also be built automatically, using the [Description Builder](/gtx/docs/specific-cost-products-1#description-builder)
The order can then be [finalised](https://help.megabus.com.au/gtx/docs/purchase-orders#finalising-purchase-orders) as usual.
Once the product has been **received and brought into stock** using either a [delivery docket](https://help.megabus.com.au/gtx/docs/purchase-invoices#delivery-dockets) or [supplier invoice](https://help.megabus.com.au/gtx/docs/purchase-invoices#invoicing-purchases), it will appear and be selectable for purchase as part of the specific cost grouping's item set.
:::(Warning) (Warning)
You **cannot edit** a specific cost product once it has been used on an invoice. If you need to change it after it has been used, you will need to either clone the product or add a new one and edit the details for that.
:::
### Description Builder
If the **Description Builder** is enabled, you will not be able to enter a Description when purchasing or adding specific cost products.
**Instead, you will be prompted to:**
* Select a **Brand**
* Select a **Size**
* Enter a **Pattern** (free text, up to 20 characters)
The description will be automatically built from these fields using the following format:
* **BrandPrefix** + **SizeName** + **Pattern (free text)**
* This will be previewed below and automatically enetered in the **Description** field, once saved.
**Note:** The description will be trimmed if the total length exceeds 30 characters
See the [Description Builder](/gtx/docs/description-builder) help guide for more information.
:::(Info) (Note)
The dialogue box may vary slightly, depending on whether the item is added via Purchase Entry, Stocktake, Stock Adjustment, or Journal Entry.
:::
## Adding Specific Cost Products
Specific cost products can also be added to groupings using [Journals](/gtx/docs/spec-cost-sec#journals) and [Stocktakes](/gtx/docs/spec-cost-sec#stocktakes).
### Journals
>not sure about the text/image order here. Feel free to swap around as you see fit. Usually I'd introduce each new window with its own line of text "The XXXX pop-up will open."" but there's so many pop-ups here that it gets too wordy.
>> I think the way you built the information below is very clear and it looks good.
**To add a specific cost product:**
* Click on the **drop-down** arrow to the right of the **{{glossary.Add}}** button
* Select **Stock**
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In the **Product Details** pop-up that opens:
* Use the **Product** picker to select the specific cost product
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In the **Outstanding Specific Purchase** pop-up that opens:
* Click on the **New Item** button at the bottom-right
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In the **Product Details** pop-up that opens:
* Enter the **relevant information**
* Include a specific **Description**
* Click **Ok**
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The product will be added to the **Line Details** list:
* Additional information can be entered in the **Narration** column, if required.
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The product will be aded to your inventory when the journal is **Finalised**.
### Stocktakes
Specific cost products can also be added during [stocktakes](/gtx/docs/stocktakes), if required.
**To add a specific cost product:**
* Click on the **{{glossary.Add Stocktake Item}}** button at the top
* Select **Add New Specific Cost Item to Stocktake List**
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In the **Add New Specific Cost Item to Stocktake List** pop-up that opens:
* Enter the **relevant information**
> * Include a specific **Description**
* Click **Proceed**
>allow description override - checkbox
>Can't enter a description?
> Can't edit anywhere else
>> Not sure what you're referring to here ^
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The product will be added to the **Stocktake Entry** list:
* Enter the **Count**
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The product will be added to your inventory when the stocktake is **[Finalised](https://help.megabus.com.au/gtx/docs/stocktakes#finalising-stocktakes)**.
>It is very annoying that the processes are completely different across the different modules and that even the buttons are called different things. Also that it is inconsistently referred to as Stock/Item/Product. Makes my job hard and our software unintuitive.
## Merging Specific Cost Products
Specific cost products can be **merged** together, using either the [Specific Cost Maintenance](/gtx/docs/spec-cost-sec#specific-cost-maintenance) module or during [customer invoices or work orders](/gtx/docs/spec-cost-sec#customer-orders-invoices).
:::(Info) (Note)
In order to merge specific cost products, **Allow Posting** must be enabled for the **Stock Costing Variance** account (20850).
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:::
:::
:::(Warning) (Warning)
Once a specific cost products have been split out, they **cannot be re-integrated** into the original grouping.
:::
### Specific Cost Maintenance
Specific Cost Maintenance can be accessed by selecting **Main > Products > Specific Cost Maintenance**.
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The **Specific Cost Item Maintenance** module will open, showing a list of specific cost groupings.
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**To merge specific cost products:**
* Select a **Salesperson** using the picker at the top
* **Double-click** on the relevant grouping
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In the **View Specific Cost Item** window that opens:
* Tick the **Merge** checkbox on the right for each product you want to merge
* Click on the **{{glossary.Merge}}** icon at the top
(or press ctrl+m on the keyboard)
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In the **Merge Specific Cost Item** window that opens:
* Enter the **relevant information**
* Include a specific **Description**
* Click **Merge**
### Customer Orders / Invoices
Specific cost products can also be merged when adding them to customer orders or invoices.
**To merge specific cost products:**
* Select a **Salesperson** on the invoice / order
* Add a specific cost grouping to the **line Details** list
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In the **Outstanding Specific Purchases** pop-up that opens:
* Tick the **checkboxes** to the left of the products you want to merge
* Tick the **Merge Specific Cost Items** checkbox at the bottom-left of the pop-up window
* Click on the **Merge** button to the right
>checkboxes untick but are still selected when you tick merge checkbox, need to tell Duncan
> why is this checkbox even here? - used to enable checkboxes, but now they are just there already - should remove
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In the **Merge Specific Cost Item** window that opens:
* Enter the **relevant information**
* Include a specific **Description**
* Click **Merge**
## Specific Cost Enquiry
A full list of currently stocked specific cost items can be viewed using the Specific Cost Enquiry module, which can be accessed by selecting **Main > Products > Specific Cost Enquiry**.
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Specific item details can be viewed by selecting the product in the list.
Unit Cost, Total Cost, Gross Profit and Gross Profit Margin details can also be shown by clciking on the Click the **Stopwatch** icon at the top.
* These columns will disappear after about 10 seconds, or you can toggle them instantly with the **Stopwatch** icon.
>why use this and not spec cost maintenance?