Click the 'Add / Import Items' drop-down shown above and to the right of the transaction items grid.
Click 'Import Sub Invoices' option in the drop-down. This will refresh the page.
Navigate to the Filter information Section.
Select the Subcontractor from the drop-down.
Select the Sub Invoice from the drop-down. This will refresh the Sub Invoice Items grid below.
Select the item(s) in the list by clicking the checkbox. Items listed are actually a summary of the details by Job Cost Code since there are various contract types.