OK I think I know what this is relating to now :)

Have you tried saving the combined model as a grouped prop?

• Start by parenting child parts to the model that you want as the parent. (You've probably already done this).
• Now open the Prop library and click on the "+" to save.
• In the popup dialog window, FIRST type in the name you want it saved as.
• SECOND click the subset option and select all the parts
• Click the OK's to finish

If you select subsets then name it forgets the subsets when you click in the name box.

Now load the saved prop and it should come in with all the features you require and none of the bend/side-side/twist dials that you are currently getting in a CR2. If you need to turn any dials off then open up the (much smaller) pp2 file in an editor and set the "hidden" attribute of the unwanted dial to 1.