Hi zul,

Inventory adjustment will only affect the Quantity on hand. Thus, adding the existing inventory on projects is unavailable.

To properly track your profitability, you'll want to make sure you used the Cost of Goods Sold (COGS) account in the product/service item.

Please refer to this helpful article for more information: How to set up Inventory tracking.

We're always here for you if you have other questions. Thanks for posting.