Something that might give you the result you’re after would be to create a View on the table using the SQL editor…
For example, I created this view with a calculated measure:
Create view view_pay as select Regular_Pay, Overtime_Pay, (Regular_Pay + Overtime_Pay) as Total_Pay from cali_pay;
Creating a table chart from view_pay gives me the measures Overtime_Pay, Regular_Pay, and Total_Pay.
I hope that helps!