To do this task
In the Select Item Receipt window, click the Vendor drop-down arrow and select the vendor.
Select the Item Receipt which corresponds to your bill.
To keep the original inventory availability date, select Use item receipt date for the bill date.
Click OK. QuickBooks converts the item receipt into a bill.
Note: Item receipts must be converted to bills one at a time. However,
once the item receipts are converted into bills, you can make a single payment
for multiple bills.