Is there a way to edit a library item and split the upholstery region into 2 parts so I can have 2 or more fabrics instead of just one?

[SueKurtzInterior]

[Renerabbitt]

53 minutes ago, SueKurtzInterior said:

Theroetically you could do it by changing the symbols smoothing angle, using the delete surcae tool to delete the sides and back, then converting to a symbol. Then do the inverse, deleting everything but the sides and back and converting to a symbol. Then you would combine the two.
However, 
a free software like blender could do this in mere minutes.