---
title: "Tie a co-product/by-product process to inventory"
slug: "bc-tie-a-co-product-by-product-process-to-inventory"
description: "Learn how to define co-product/by-product processes, assign output items, and tie them to production BOMs effectively in your inventory management."
tags: ["BC", "Business Central", "Food", "Task"]
updated: 2026-06-25T09:59:16Z
published: 2026-06-25T09:59:16Z
canonical: "docs.staedean.com/bc-tie-a-co-product-by-product-process-to-inventory"
---

> ## Documentation Index
> Fetch the complete documentation index at: https://docs.staedean.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Tie a co-product/by-product process to inventory

When defining a co-product/by-product process, enter the output items on the **Output** FastTab of the co-product process version card. This means the output items must already be set up in the program. During initial setup, however, it is not possible to tie co-product items to a production BOM, because the production BOM has not yet been created. Once output items are assigned to a co-product/by-product process, you can tie this process to the appropriate inventory items.

> [!NOTE]
> Note
> 
> Only inventory items entered as co-products can be tied to a production BOM. Because by-product items can come from several co-product/by-product processes, they cannot be tied to a production BOM.

## Steps

1. In the search box, enter **Items**, and then choose the related link.
2. Open the relevant item card and click the **Replenishment** FastTab.
3. Choose the **Production BOM No.** field and select the production BOM to which the item is assigned as an output item.
4. Enter the item's own number in the **Production Grouping Item** field.

A production grouping item identifies a common intermediate item that groups together production requests for finished goods sharing the same intermediate. Because the output item of a co-product/by-product process is an intermediate, assign it as its own production grouping item.

After you tie an item to a co-product/by-product process, it may be necessary to calculate the standard cost of the item.

## Related

- [Co-products and by-products](/bc-co-product-by-product.md)