Postgres and more than 2 Locations for storage

Hello all,

I am trying to setup Postgresql to run in more that 2 locations.

Setting PGDATA and PGDATA2 work fine with out a problem but I would like to
setup more that those 2 locations ie PGDATA3(4,5,ect) and can not seem to
find if this is possible or not.

I know that i need to initdb the location if i want to run a separate
server on a separate port or just initlocation for the same (atleast I
think i understand that) and have tried both for PGDATA3 and i get error
pertaining to "ERROR: Postmaster environment variable 'PGDATA3' not set"

What can I change to make this work?

Thank you all for your help