"Create Net Class" in LayoutXL

Hello,

How can I generate net classes graphically for assigning contraints
afterwards?

In the Virtuoso XL Layout using XL Probe there is no "Create Net Class"
option as described in the online help

I am trying to follow the instructions of the
Virtuoso Constraint Manager Known Problems and Solutions


PCR: 433771 Allow selection of multiple nets in the CM UI.

Description: The constraint manager user interface does not currently
allow the selection of multiple nets from the net-based constraint form.

Solution: To apply constraints to multiple nets, create a net class
first then apply constraints to the net class



Thanks for any help



Norman