How to select vendors on the basis of items in purchase order?

Hello Experts,

Hope you all are doing well !!!

My query is that when we add purchase order we first select the vendor and items to be ordered from that vendors and add the order

This is the Standard SAP B1 functionality

But my scenario is reverse, in purchase order first Item should be selected and all the approved vendors for that items should popup

then user will decide from which vendors he/she want to buy those items.

Awaiting for your suggestion on this

Regards

Altaf