---
title: "Specific Cost Products | GTX Training"
slug: "specific-cost-products-bt"
description: "Learn the basics about Specific Cost Products in Marlin GTX trusted automotive software by Megabus."
updated: 2026-02-13T05:01:53Z
published: 2026-02-13T05:01:53Z
canonical: "help.megabus.com.au/specific-cost-products-bt"
---

> ## 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 BT

****Marlin GTX**** enables made to order or non-standard products to be managed by grouping individually purchased items under a single "specific cost" grouping.

Specific cost groupings represent products that are **ordered as required**, rather than held as fixed stock (e.g. such as brakes, engine components, batteries, etc.).

The **broad product grouping** is first added as a "specific cost product".

**Specific products** can then be added to the category by adding them to a **[Supplier Purchase Order](/gtx/docs/specific-cost-products-ob#purchasing-specific-cost-items))** or during [Journals](/gtx/docs/specific-cost-products-ob#adding-via-journals) and [Journals](/gtx/docs/specific-cost-products-ob#adding-via-stocktakes).

## Adding Specific Cost Groupings

Specific cost groupings are added through **Product Maintenance**.

**When adding a product:**

- Select **Specific Cost** from the **Costing Method** drop-down
- Enter the remaining **product details** as required
- Default **costs and prices** can be entered if required, or left blank

Individual items currently in stock can be viewed from the **Items** tab.

Once an item is sold, it is automatically removed from the list.

## Purchasing Specific Cost Items

Specific items are added to groupings by **purchasing** them.

**To add a specific cost item to a purchase order:**

- Select the specific cost grouping using the **Product** picker
- Enter the specific item name in **Description**
- Enter the **Quantity** and **Cost**, as usual

Warning

Once a specific cost item has been used on a customer invoice, it **cannot be edited**.

**If changes are required:** a new item must be added or an existing one cloned.

### Description Builder

If **Description Builder** is enabled, manual descriptions cannot be entered.

Instead, you will be prompted to, select a **Brand** and **Size**, and enter a **Pattern** to build the description from.

For Further Details

See the [Description Builder](/gtx/docs/description-builder) help guide.

## Adding via Journals

Specific cost items can be added using **Journal Entries**.

**To add an item via journals:**

- Click the drop-down next to **Add**
- Select **Stock**

## Adding via Stocktakes

Specific cost items can also be added during **Stocktakes**.

**To add an item via stocktake:**

- Click **Add Stocktake Item**
- Select **Add New Specific Cost Item to Stocktake List**

## Adding Specific Cost Products to Invoices

To add a specific cost item to an order, select the grouping using the **Product** picker, as usual.

Use the **Outstanding Purchases** pop-up that opens to select the specific product.

The **New Item** and **Clone Item** buttons at the bottom of the pop-up can also be used to add new specific cost items, if required.

For Further Details

See the [Specific Cost Products](/gtx/docs/specific-cost-products-1) help guide.

**Add** button

![](https://cdn.document360.io/d7282b31-60c4-41e6-bf87-3f684d4da049/Images/Glossary/image-1704776179584.png)

Shortcut: **Insert**

**Add Stocktake Item** button

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