While Charlene's solution is nice, it misses an important point. If you manually enter inventory receipt, you are missing a useful feature of Quickbooks. Anyway here's how we do it - you might want to try it:

• When we receive the inventory, we check the items received against the packing slip.
• We contact the vendor to correct any discrepancies
• In Quickbooks from the Purchase Order, we "Add to Bill" to create a new bill which will match the packing slip and correct the Bill to match the packing slip as corrected for items actually received.
• In creating the Bill, the items received are automatically added to the inventory.
• When we get the invoice, we "send payment to the vendor and in Quickbooks "Pay Bill"

This fully uses the automation feature of Quickbooks for inventory control. It's simple and does not require any manual corrections or entries for almost all of our inventory receipts.