If I understand you correctly, I'm guessing that you have one Table that will store the purchase, and a second Table where you store the bonus points info. Therefore, you will need to update both tables at the same time.
This is a little tricky to do by hand, but here are the instructions:
http://www.macromedia.com/support/ul...ult_tables.htm
Read them carefully and take your time. Also, make sure you back up your pages before you try this. It will take a little time to master the technique described, but it's worth it. I've been doing this for a year now, and it's VERY reliable.
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There is also a commercial product called the Firefly Data Connection Kit. It's not for sale right now, but you might be able to track it down. Here's some info about it:
http://www.macromedia.com/devnet/mx/...omponents.html
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By the way, I hope I'm on track here. If you just want to subtract some points from a table, just look up the simple
VB Script math functions and work with them. They're very easy to use.