I'm here to share some insights about this, PrestigeLock.

In QuickBooks Online, the item will be added automatically to the Products and Services list after creating a bill from a purchase order. 

For QuickBooks Desktop, you can receive inventory without a bill after you record a purchase order. 

Here's how:

1. Go to Receive Inventory dropdown, then select Receive Inventory without a bill.
2. On the Item receipt window that appears:
1. From the dropdown, choose the vendor name.
2. Select Yes to receive a purchase order for the bill.
3. Choose the correct PO, then select OK.
4. Review the information on the Item Receipt. Note that except for the Memo field, any fields that were filled in on the PO are carried over to the Item Receipt.
5. Select Save & Close.
3. When you receive the bill for the inventory, proceed to Entering bills against Inventory.

For further guidance with the process, please see this article: Receive Inventory.

Once you record what you owe to your vendors in QuickBooks Desktop, you can now pay your bills to settle your payables. Please see this article for QuickBooks Online.

Please do let us know if you need further assistance in managing your vendor transactions and inventory. I'm here to help you out.