I am currently a 14E10 and my mos is on the BEAR list but not for PFC. I want to switch mos so that i can change to a specific duty station. Is this possible. I will choose an mos on the BEAR list as long as it is at Ft. Deterick MD, or Carlisle Barracks, PA.

Not really sure what you are trying to do. Are you a 14E now or want to enter the BEAR program for 14E? How much longer are you going to be a PFC?
Can a 14E go to MD or PA, that is a question for your branch.
The only way to get a promised duty station is to reenlist for the E-4, Overseas option or E-5 Conus station of choice. If you reclass either through the BEAR program or E-3, Army training Option, you will not have the choice of duty stations upon completion of MOS course.

I am a 14E and have been a PFC since June. I would reclass to another mos that is on BEAR so that I can get MD or PA. I don't care about the mos, just the duty station. They do not have 14E any closer than Bragg.

You will only be gauranteed the MOS training, not a duty station after training.