[jochen]

I have following

Action 1
Subaction 11
Subaction 12
Subaction 13

Subaction 11 ist defined with date and time for start and end.

Is it possible that the due date of subactions 12 and 13 has a reference to finish date of subaction 11.
This is possible in time project applications.
Example:
Start of subaction 12 = finish date + 2 day of subaction 11

Jochen