Add a custom calculation column

Summary

I want to add a couple of columns into my analysis which contain custom formulas

Content

Hello,

I am sure this is a very simple answer but I was hoping someone would be able to provide some guidance on how I create a custom column in my OTBI ad-hoc analysis which has a custom formula in it?

So one column I have is the "Invoice Total Amount" and then the column next to it is "Total Tax Amount". I want a custom column next to it which subtracts one from the other.

Thanks for any help

Nick

Version

Fusion 20C