In Unified Modeling Language (UML) sequence diagrams, you can add
or remove covered lifelines to or from interaction occurrences.
You must have a sequence diagram with lifelines open in the diagram
editor.
To add or remove covered lifelines to or from an interaction occurrence:
In the diagram editor, right-click an interaction occurrence; then
click and complete one of the following
steps:- To add covered lifelines, in the Add Covered Lifelines window,
click the lifelines to add and click OK.
- To remove covered lifelines, in the Remove
Covered Lifelines window, click the lifelines to remove and click OK.