You can create child diagrams from object symbols in Operational State Transition diagrams.
1 In the diagram containing the operational activity to decompose, right-click the operational activity symbol; then click Child Create.
The Child Create dialog box opens showing the name of the symbol on the parent diagram in the Name field and the diagram type of the parent diagram highlighted in the list box.
2 If you do not want to use the name of the object symbol on the parent diagram as a name for the child diagram, type a new name in the Name field.
You can change these values; however, to conform with the IDEF0 specification, it is a best practice to accept the default values.
3 If not enabled, select OV-6b Op State Transition in the list box.
4 Click OK; when prompted to save the parent diagram, click Yes.
The child diagram is created.
When you create a child diagram for an operational activity, the modeling software draws a shadow underneath the parent operational activity.
Note By default, swimlanes appear on the child diagram. You can remove the swimlanes by opening the diagram properties and selecting None on the Swimlanes tab.