You can create a Structured Activity Node through an Activity Diagram or a Modeler pane.
On an Activity Diagram, when you create an item in or move an item to a Structured Activity Node, that item is scoped to the Structured Activity Node. If an item is scoped to a Structured Activity Node and you move that item to the diagram background or to another Structured Activity Node, the item is rescoped accordingly.
To create a structured activity node through an activity diagram:
1. On the Activity Diagram toolbar, click the Structured Activity Node toolbar button, and then on the Activity Diagram click in free space or within a Structured Activity Node.
2. Type the name of the Structured Activity Node, and then press the Enter key.
To create a structured activity node through a Modeler pane:
1. In a Modeler pane, right-click the Activity that is to own the Structured Activity Node, point to New, point to Activity Group, and then click Structured Activity Node.
2. Type the name of the Structured Activity Node, and then press the Enter key.
Structured Activity Node toolbar button, and then on the Activity Diagram click in free space or within a Structured Activity Node.