You can use the Expression window to create and modify an expression. You can type in the expression in the Expression field, select a tag via the browse button or create the expression using a combination of manually entered code and tags.
The fields and check boxes that are displayed on the Expression window vary according to the type of item with which the expression is used. For example, the Expression window for Mimics has some different features than the Expression window for Trends.
To display the Expression window, see Accessing the Expression Window.
For information on using the various fields and check boxes on the Expression window, see Working with the Expression Window.