Architecting and designing
  
Select for node tree generation (decomposition)
To automatically generate a Node Tree for a Function/Activity:
1 Create and save a Node Tree diagram.
2 Associate the Node Tree diagram with an IDEF0 Model.
3 Open the Node Tree diagram.
4 From the Draw menu, select Decomposition to open the Select for Node Tree Generation dialog.
5 In the box containing the list of diagrams, find the starting diagram for the tree (generally the Context diagram) and click the + symbol to the left of the diagram name.
6 Select the Operational Activity symbol that you want to decompose and click Build. System Architect will draw the Node Tree Diagram.