Is it possible to select variables instead of typing?

I would like to know if it is possible to select the variable instead of typing it every time.

For example, If a variable is defined in the bigening of the sheet and has to be used later in different equations. At the moment user have to type in the variable every time and it is possible to make a typing mistake, which would make the equation incorrect.

In visual studio, once you start typing it will show all the matching previously defined variables, is there a functionality like that?

Thanks

Manish