If you have followed the guide to setup Parts Internal Transfers, you will have the ability to check the availability of a part internally before you do a external supplier order.
Question
How can I view a Parts Availability Internally?
Answer
When creating a Parts Sales Invoice, you may notice that the part you are wanting to invoice is currently not available in your department, if you have internal transfers set up, you are able to check the availability by firstly going to Parts > Sales > Invoice
Enter your part number as below, and see there is no availability
If you want to check the availability of this part internally before ordering, click the availability button highlighted and you will see the below screen showing the availability chain at the branches you have setup for internal transfers.