partition off
US /pɑːrˈtɪʃ.ən ɑːf/
UK /pɑːrˈtɪʃ.ən ɑːf/

1.
to divide a larger area into smaller sections using a partition or barrier
:
•
They decided to partition off a section of the room for a new office.
•
The large hall was partitioned off into smaller exhibition areas.