I see you already have some answers, I don't have time to read them all, if they work thats great, if not this is a method I used to do a similar thing, I'm not saying it is the best method, just that it worked for me, and sometimes it can be good to have alternative methods to try. This is the method I used. Open the cr2 for the Fantasy Suit in a text editor, determin the name and location of the obj file. Sve a copy of the cr2 as "Boots.cr2" (for example). Import the obj file into Poser, un-tick all import options. Open the Grouping Tool, use "Spawn Props". Delete the original obj you imported from the Poser document (NOT from disk!), then delete all the objects that are not part of the boots. Export all the boot parts to one obj file "Boots.obj", tick only "Include Body Part names", "Include Existing Groupes..." and "As Morph Target..." in the export options. Reopen the "Boots.cr2" in a text editor. Edit the two "figureResFile" lines to point to "Boots.obj". Resave the cr2. Reostart Poser and test "Boots.cr2", Hopefully you now have a conforming pair of boots. Notes: I am not absolutly sure I gave the best export options for the obj file, but these have worked for me in the past. Although the cr2 only contains geometry for the boots it still lists all the actors from the original file. If you like you can go through the cr2 and change "hidden 0" to "hidden 1" and "addToMenu 1" to "addToMenu 0" for various actors to hide them from the menu, i.e:

actor hip:1
        {
        name    GetStringRes(1024,6)
        on
        bend 1
        dynamicsLock            1
        

There is probably a lot of stuff you could delete from the cr2, but off the top of my head I am not sure what is safe to delete and what is not, you would have to experiment, safest is just to leave it all there.