Parent to Universe is correct - usually...

But if the prop is parented with "Inherit bends of Parent" checked (and you can't know, if it was a 3rd-party prop), then unparenting can cause problems.

If "Parenting to Universe" causes the prop to do something wierd, the alternatives that might work are (IIRC):

• Export the prop (still parented) as a .OBJ file, remembering to check the "Include Existing Groups" (or whatever the option actally is..) delete the original and imort the saved .OBJ
• Select the Prop, use the Grouping Tool and "Select All" then "Create Prop". Save it if necessary (as a new prop). This latter gets a little more complex if the prop in question has more than one group...

Hope that helps,
Cheers,
Diolma