Merge more variables in a new variable

HI @Plankton @ulrich @Timo

How i can merge multiple variables in a new single variable ?

What type of command i must use ?

This sum numbers in variable

executeScript_Sandbox | return Number ({Var1}) + Number ({Var2}) | Var3

But if I have variables with strings saved how I can merge all in a new variable ?

Thanks

Solved the solution is simple without using executeScript_Sandbox

store | ${Var1}${Var2}${Var3} | Var4