Report Cost of Item from POS

Is there a tag to pull the cost of an inventory item into the POS screen?

Basically I want to check the cost price of an item before I give a discount.

Ideally if this is possible I then want to calculate the total cost of all items in a ticket so I can see total profit for the sale.

It would be a report expression I expect, from recent posts I think you need to store the inventory item name in a product tag and then report inventory item cost using that custom tag for the name constraint.
It was discussed not so long ago, - please be sure to search.

I done a quick search but did not find exactly what I was looking for.
I’m going to use SQL to extract the information required.

{REPORT COST DETAILS:X} will give Cost of items.