You can create a Central Buffer through an Activity Diagram or a Modeler pane.
To create a central buffer through an activity diagram:
1. On the Activity Diagram toolbar, click the Central Buffer toolbar button, and on the Activity Diagram click in free space or within an Activity Partition, Interruptible Activity Region or Structured Activity Node.
2. Type the name of the Central Buffer, and then press the Enter key.
To create a central buffer through a Modeler pane:
1. In a Modeler pane, right-click the Activity or Structure Activity Node that is to own the Central Buffer Node, point to New, point to Object Node, and then click Central Buffer Node.
2. Type the name of the Central Buffer, and then press the Enter key.