help

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I have a tblTransaction, tbltransactiondetail, tblinventory, and
tblinventorybalance.. my operations includes sales and deliveries.. how can i
make that every delivery of such product it will add to its balance in the
tblinventorybalance..? And every sales will subtract to the product balance
in the tblinventorybalance?

i nid help pls...

tnx...

hope sumbody will answer this as soon as possible...