Hi JZama110492 , have a look at the transacton screen "Adjust Inventory".
The transaction lines should be completed as follows:
Item number - your item code
Quantity - the (positive) quantity required
Unit Cost - this may automatically appear, if not, use a realistic cost for that item
Amount - this will calculate for you
Account - this is a code from the Accounts List, should be a cost of sales or expense account such as Inventory Adjustment. Do not use an inventory asset account here.
Job - a job number if you use them.
You can add lines to adjust other items.
Memo - optional, leave blank.