Projects Classification Question

Hi,

I have 2 project classifications setup:

- A (with values 1, 2, 3)

- B (with values 4, 5, 6)

I would like User X to have access only to project classification 'A' and give access to User Y to both project classifications (A,

Basically User X shouldn't be able to add new values for project classification B.

Is possible to restrict this using forms personalisation or any other feature? If yes, how can I do it.

Thanks,

cv