Purchase Requisitions

Hi all

I have a sharepoint list for capturing purchase requisitions. Using flow and automate I have it so when an item is requested it automatically emails the approver and the when approved emails the purchase manager.

The downside at the moment is I can only add one item per requisition. 

What is the best way to make a multi item form to populate my list and send the approval out. (E.G A requisition for three different items. Item 1 - A PC, Item 2 - a monitor, Item 3 - a printer)

Thanks in advance for all help