Trying to replicate the Excel Indirect comand in Access

I have two tables: Trades and Specialty, each Trade has multiple Specialties. How do I use you use the value of the Trade combobox in a form as criteria for the rowsource of the Specialty combobox?

The following expression in Row Source works for the Trade “General Construction”:

SELECT Specialty_tbl.specialty FROM Specialty_tbl WHERE (((Specialty_tbl.[trade])="general construction"));

How do I replace “General Construction” with a statement that will point it to the combo Box in the form where I selected the Trade?
I’m not very good with VBA so I’m doing this in the Form properties or the query properties window.
AljobuAsked:
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Patrick MatthewsConnect With a Mentor Commented:
I would implement this using a "parent" form for Trades, and a subform for Specialties.  When you do it this way, Access will ask you which fields to use to join the two together.
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