Check out the "evaluate" function. It could be used like this:
Evaluate ( Table::field )
Where Table::field is a text field with this text:
Dimensions::Length * Dimensions::Width * Dimensions::Height
I know, not the formula you need, but should be enough to get you thinking as to how you might do what you need.
Thanks for the input! But unfortunately this is beyond my current level of expertise so I'm going to have to hope I can dig up a tutorial or a REALLY good example somewhere.
Then perhaps you shouldn't try to implement this method.
You might consider using a case function to selectively use your different formulas.
This worked out for me just fine! Thanks!