Assuming that you have defined a relationship between the two tables that uses your two description fields as match fields, you can perform a find that omits all Table A records that do not have a matching Table B record.
Base your layout on Table A.
Enter Find Mode 
Set field [Table B::Description ; "*" ]
Set error capture [on]
Perform Find 
Genius! Thank you so much. Can't believe I didn't think of that.