How model nested activities in an Activity Diagram in Papyrus

Question

I am trying to create nested activity diagrams in Papyrus.

My Problem: I don't know how to create a sub-activity-diagram directly from an action of my main activity-diagram. I want also to transfer ports from the action to the sub-diagram. In cameo it works easily as described in MagicGrid Handbook:
create sub-activity-diagram from an action
sub-activity diagram including ports

In Papyrus I can only create a sub-diagram manually and then create a hyperlink to the main diagram. But ports are not transferred in this case.

Any idea? Thanks and BR, Lennox