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Hi rgs and welcome to the forum,Have a look at the following post, should be what you are after. Just substitute references for ORDERS with Category and SUBPRODUCTS with instrument.http://forum-en.filemaker.com/fm/board/message?board.id=FM-en-4&message.id=3061&query.id=50364#M3061I hope this helps.
Thanks very much. I'll give it a try!