Confirm there are not already settings or features that do what the shop is asking for.

No there is no feature for to get Reports with live sale for vendors and variants for the items sold.

What does the shop want the product to do?

Shop need a report for Live sale Report for 30A Array event with vendors name and variants for the items sold.

Why/how would it improve sales or efficiency?

It will help shop to know the selling number of items and the variants for the items sold. with the Vendors name. That will help shop to order the Items form the vendors as per their sale.