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First I am going to suggest you implement the iif function defined here.
https://www.itjungle.com/2005/11/09/fhg110905-story01/
Then you can use that like ....
MyFinalString = iif(V1 = *blanks: ',': V1 );
MyFinalString = %trim(MyFinalString) + iif(V2 = *blanks: ',': V2 );
MyFinalString = %trim(MyFinalString) + iif(V3 = *blanks: ',': V3 );
MyFinalString = %trim(MyFinalString) + iif(V4 = *blanks: ',': V4 );
MyFinalString = %trim(MyFinalString) + iif(V5 = *blanks: ',': V5 );
MyFinalString = %trim(MyFinalString) + iif(V6 = *blanks: ',': V6 );
Sincerely,
David H. Lerman
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