Is there a way to create an inventory item on the fly in iProcurement and create a requisiton for t

I have an unusual request from the business and I am asked to provide a solution.

Here is the scenario;

A user is trying to create a requisition for an item that should be available/defined in the item master catalog.

Our items are cross referenced with manufacturer part numbers, but the user is not able to find the item he is looking for.

Since he is encouraged to only create inventory type requisitions, he needs to be able to have an option to create an inventory type item 'on the fly' (somehow), and also create a requisition for that item.