Hi there is a Python Script that does this with one click

you choose who will  be the master parent

Click "parent all"

every scene item  will become parented to that Master parent you chose
then save the master parent to the prop library and choose "select subset"

in the hiearchy manager  select the  master pparent while holding down both the ALT +command key

the entire set will be selected and  saved to your  prop library and will load all at once from your prop library in the future

I use batch import script from philc to bring  props from C4D With HUNDREDS of pieces for my poser physics dynamics  simulation
like the ones seen here
they are all saved as massive ready to use sets to my library

Cheers

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