Expressions to do basic math

[[Du...]]

Ive been tasked with adding and subtracting dN from one another and the sum of the two dN must fall within a tolerance. So my question is with an hour or two of research already, how do you add or subtract dN of 2 surface points? Also adding a tolerance to it for the requirements. TIA

[[Ma...]]

If you want to have such calculations, you have to add those measurements into variables at top of a user defined measurement window.

Then in formula you use "A.actual + B.actual"

Same thing can be with .nominal at nominal section.

Tolerance should be there also.