Are you talking about the ill-conceived Lookup Field "feature"? You should
never use it. See http://www.mvps.org/access/lookupfields.htm at "The Access
Web" for a discussion of why not.
Your query should join the appropriate tables and bring back all of your
data. This is actually true even if you're using Lookup Fields.
A combo box is a tool, a way of displaying data from one table and
storing it into another table. Of course you can put a Combo Box on a
form; that combo box can be based on a table or on a query, and the
field to which it is bound can be based on a table or on a query. It
is NOT necessary to use Microsoft's misdesigned, misleading, and very
limited "Lookup Wizard" in order to do this. See
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