Hello, our accountant has set up two separate chart of accounts. Inventory and CIP for each item. When inventory is purchased it’s posted to the inventory account, we keep track on a spreadsheet system to track items pulled  from inventory, then manually do a journal entry from inventory to CIP account for that item. Once the job is completed and billed out, another journal entry is made from CIP to COGS. A lot of entries and recording but it works.