Add/subtract a Quantity from your inventory

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This is in reference to the microsoft Article ID: 252813.

Web page : http://support.microsoft.com/?kbid=252813

I tried the article method, but it subtracts the only the first record of
the subform, rest all the records of subform is as it is. I mean the while
running the codes/query, it subtracts/works for only the first row of the
subform data

Please advise me a method, where I can click, and it should work on all the
record of subform, either by update query or by VB code. On Button click from
Main Form event will be preferred.

Regards.

Irshad