[Snow]

Select all surfaces of the seat and then go to the "Surface" menu and select "Cut away object". This makes the seat a separate object and you can hide it without losing it.

If you can't reach every surface of the seat, just do it with the ones you can reach, then hide this object and do the same with the remaining surfaces of the seat.
After separating all parts of the seat as objects, switch to object mode, select your various parts of the seat and merge them into one single object again.