To add a **reference** Interaction do the following:

Precondition: A Sequence Diagram exists in a package and it is opened.

  - From project browser right click package->Add Element...
  - Toolset: "SysML" "SysML 1.5 Interaction"; Type:"Interaction". Give a name.
  - Save and Exit
  - An Interaction is created and its Diagram initiated.
  - Drag the //new diagram// from browser to the opened Sequence Diagram. A pop up window will be presented
  - Drop Diagram As... -> Interaction Occurrence-> OK