Hello accounts313:waving_hand:, Thanks for contacting the Community and welcome! Are you wanting to associate the cost of goods sold on in category details or item details? Have you set up a nominal code in accounting>chart of accounts>new for this? If so you should be able to use on either bill or expense in either section(in the latter if you have a product set up pointing to that account for purchasing). Do you get an error when creating the bill and expense or does it grey out when you try to select it? Thanks