The project tree displays the following information:

Action Lists

Add a new Action List by right clicking any Action List and choosing "Add Action List..."

To reorder Action Lists:

Project Global Scripts

To open a Project Global Script:

Variables

To add a variable, right click Variables and select "Add Variable"

To edit a variable, right click it and select "Edit Variable", or double click it.

To open the Edit Variables dialogue, select "Edit Variables" from any variable's context menu, or click the Toolbar icon.