Cut through the rhizome, using clean cutters
and separate your plant.
Depending on a size of your orchid, you may want to
make 2-3 or more divisions. To insure continued flowering in shortest time, each division should have at least 4 pseudobulbs.
Repotting an orchid
Fill bottom of a pot with potting medium and wrap some
around roots. Place your plant into pot and add more potting medium packing firmly so no air pockets are left in the medium.
The rhizome should be exposed,not covered.
You may also just cut the front division, the newest growth from the plant, without
taking the whole plant out of the pot.