Unmatched records in Crystal Reports

I have table "A" that contains a large number of outdated records and table "B" that has current records.  The common link is part #.  I want a list of all parts in table "A" that do not have a record in table "B" so I can delete the outdated records in table "A".  How do I do this?  I'm using a left join from table "A" to "B", based on the part #.  
sfriskAsked:
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mlmccCommented:
One way to do this is to use conditional suppression

Put the information you want in the detail section

Right click the detail section in the left margin
Click SECTION EXPERT
Click the formula button to the right of SUPPRESS
Not IsNull({B.PartNum})

mlmcc
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sfriskAuthor Commented:
Thank you, that did it.  
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