Using "BasicNumPackages" field in Invoice for Tracking ................

I want to Use "BasicNumPackages" field in Invoice along with Item qty, for tracking "Packing Material Consumed".
I am unable to Store +Value in case of Purchase Entry and -Value in case of Sales Invoice.

Tip/Logic will be helpful.
Thanks in Advance

 

Anyone................................................

 

Please find the attachment of Source. Only Field "Global VCH NumPack" is Used. I mean how to store Dr or Cr in case of Purchase or Sale Voucher Entry.
This Field is used to Report Inward Qty and Outward Qty.

 

admin,
please ref above code ( tt.txt) sent by co member where in only 2 columns "marks" and "no.of packages" are included both
in screen and print mode
sir, please let me know how to link the multiple of these two column to be the "qunatity" of default tally i.e
marks * no.of packages = quantity
thank you in advance

 

i also request my co members who can help me in this case...... awiting your reply Thanks.

 

Modify Default Qty Field as desired [Qty=A * B]. Also refer dimension Example is Tally Samples

 

thanks.......