Hello - what is the correct process to follow when allocating inventory items to a particular job (for job costing purposes).... but you do not want those items to appear on the invoice... but still want your inventory levels to reflect the correct quantities?

We are a construction company, and our customers accept quotes for the total project costs.

We invoice the customer the quoted price (ie: $10,000 for a project/renovation), and then use materials out of our inventory to complete the work.   How do I post entries within QB Desktop to reflect the materials used for a particular job (DR: cost of goods sold,  CR: Inventory), but not have the program create the sales side of the transaction?

Thanks in advance for your help!