How to add a backshell port to a variable connector?

Hi there!

I'm trying to make a variable connector with a backshell port, but I couldn't find any instructions how. In the help, it just says that the backshell ports doesn't count in the BID num_of_pins parameter. I just have to add another port to the connector, like I did with the one that will be multiplied according to the num_of_pins parameter? Or is there a special way to make backshell ports? How will the Creo Cabling handle these kind of ports in the 3D? It needs to have an entry_port parameter, the same way as the other ports?

Thanks,
Laszlo