Brendan:
After you have created the sub-menu "Save Selection As..." (although it can have any name) where you want it in your menu structure, change the pop up in the middle section (Application commands and menus) from "All
menus in alphabetical order" to "All
commands in alphabetical order". Then go down this list and add the commands you want in the sub-menu (Object..., Door..., etc) one at a time (or you can use the Shift or Command keys to select multiple commands to add at once). If you click in the "All commands in alphabetical order" list then type the first few letters of the command you want to add, the selection will jump down this list to that spot for faster selection. I know this works, this is what I needed to do to add these new commands to my old Work Environment.
David