Upvote:6
I found this map posted on Flickr, though I can't vouch for its accuracy. Given the names listed as governor and MTA chair, it is somewhere in the range of 10–15 years old.
If this map is correct, most of the upper-level platforms have direct access to the 47th St. cross-passage, from which one can then exit at either of the 47th St. exits. Alternately, one can follow the 47th St. cross-passage to the Northeast or Northwest passages, which can then be used to get to either the Park Ave. exits or the 48th St. exit. The only upper-level platforms for which this does not apply are 23/24 and 32/33; these have staircases leading directly to the Northeast & Northwest passages (respectively) instead.
All of the lower-level platforms should have stairs leading to the 45th St. cross-passage; from there, one can access a set of stairs leading up to the Northeast and Northwest passages as well.