I'm not sure this is the place for enhancement suggestions, but….
I tried to populate the "log. Interface" with my real network data and I found a restriction that sould (I guess) be simple to correct. First I assume that "log. Interface" means "logical interface", if it is the case why can I not use a logical interface to build another one ( only physical ports are listed). I explain :
You can have two physical ports you bundle together to create a LACP channel and on this channel you create several vlans.
May be I'm not using the correct procedure ?