You can create an expression using any of the following methods:
On the Outline tab, right-click
Expressionsand select Insert > Expression.Click Expression
in the main toolbar.Select Insert > Expressions, Functions and Variables > Expression from the menu bar.
Whichever method you choose, the Insert Expression dialog box appears.
Under Name, type a name for the new expression.
Click .
In the Expressions details view, under Definition, enter an expression. For details on using the Definition area, see Definition.
Click Apply.
Optionally, select Plot or Evaluate to examine the expression.
Note: In the Expressions details view, you can right-click and select > to add more expressions, but only if no existing expression is highlighted.