Template Studio contains an Expression Library where you can store commonly used expressions. The Expression Library ships with many pre-built expressions, and you are able to add and edit expressions.
To the right of most Expression fields there is a button to open the Expression Library:

You can create new expressions, edit existing ones, or you can copy them (Clone button).
If one of the existing expressions suits your needs, you can choose it, press the Select button, and it will be copied into the Expression field.
In order to add a new expression to the library follow the steps below:
- Click the Create button and the new expression window opens.
- Enter a name for the expression, choose the Group and add a Description.
- Add the expression. After inserting an expression the Save button activates. When you Save the expression, it is validated. If the expression is not valid it will give you a message and will not save.