Most PDKs have two site customization files namely: cds.lib and .cdsinit
the first loads PDK components in your library-path and therefore appear in library manager to use. The other file includes a set of SKILL commands to be loaded to customize the tools in certain way or to add some functionalities related to the kit, such as adding pull-down menus, buttons, ...
So, look for these two files, and simply, run the icfb from the same folder where they exists.
I hope that helps you.
Regards,
Ahmad,