Tony,
You cannot sell (or even give away) your reservations for Whitney Permits. Only you (or an alternate leader if you designated one) can pick up ALL the permits.
The right thing to do is call the Wilderness Permit number, 760-873-2483, and release the permits you don't need. That way, someone else can call in and reserve them (up to two days before the hike).
If you don't call and release them, they become available to walk-in people the day before a day-hike (2 pm), or the day OF an overnight hike (11 am).