The Scenarios view can be displayed through either the element 'Properties' dialog or the Responsibilities window. It offers a wide range of facilities for generating and modifying scenario specifications, which you can use to quickly and easily define the structure, actions and interactions of the scenarios defined for an element such as a Use Case. These scenarios can be the main (basic) path, alternate paths or exception paths.
When you open the Scenarios view it defaults to the basic path so that if it does not already exist, you can create it. You can create alternate paths and exception paths as part of the process of adding them to steps of the basic path.