Multiple parameter query

J

JoeA2006

I need a form to allow the user to drill down to records using a multiple
parameter query. In the columns criteria I have something like this
[Forms]![Form3].[Form]![Text3].

I will have three parameters entered from the form Date , Mfg and part number
How do I allow the user to only enter Date and Mfg and part number leave
the part number text box blank but return all records for the date and mfg?
 
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