How to use the values ​​entered in the others in all tabs

[Gilberto-b]

I am new to using Form Tools and after searching on the net I cannot find how to keep a value appearing in my first tab and use it in the following tabs. Once I move to the next tab with the function " {{$var=fields[1].submission_value}}" the value is initialized to the value of the field of the next tab. Can anyone help me?