Adding variables

Is it possible to use ope= to add two variables together. Our syntax is currently


...but that doesn't work!

Hi,

Parameter "ope" doesn't support embedded fields.
[var] fields can be placed only in parameters "file", "script", "if", "then", "else" or "when".

TBS does only very simple modification on data. PHP is the best solution for complex operations.
Why don't you do a $c = $a + $b , and then [onshow.b] ?