Is it possible to create process decompositions in TDFD?
Not at this moment. For each level you have to draw a separate diagram. The Diagram text field in TDFD and TEFD helps sets the prefix of new data and control process indexes. It does not offer much more. We made a specification of an editor that manipulates leveled data flow diagrams [6]. Our plan is to make an editor in which you can edit an entire data flow model, in particular all diagram levels.