find contents of a field

The simplified scenario: a layout with fields: item, brand, price, unitprice. I would like to write a script whose purpose is to find other records that match the currentitem and then to display only the item, store and unit price on another layout. I want this find to be executed with a button on my original table, so I want the script to know what the active field contents for item are. I am new to filemaker and am going nuts trying to do this very simple thing. How do I pass the active field contents for item into the find function within a script and return the find set???