Local variables are most often used with Assignment functions, which can assign expressions to local variables that are used in a complex equation. (For details, see Assignment Functions in Formula Functions Reference.) This technique can sometimes simplify building an equation and improve the efficiency of its evaluation.
3.

In the middle pane of the Formula Editor, select Local Variables from the list.

4.

Click New Local.

5.

Enter a name for the local variable. By default, local variables have the names t0, t1, and so on, and have missing values.

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You can also create a local variable from an expression. Rightclick the expression in the Formula Editor and select Create Local Variable from Expression.

See Use Local Variables in a Formula, for an example of referencing local variables in a formula.