Pinne, check out the Undesignated group for more info on Seaman Pact.
I'm glad I've been able to help you.
It's Seaman-Professional Apprenticeship Career Tracks (S-PACT) Program. It is also sometimes referred to as Seaman/Surface-PACT. As Pat (MP) indicated, you will find people who know about that in the group, Undesignated...What's Up With That? (clickable link). After BC, he will go across the street to the TSC for 3-4 weeks (it could be longer if he has to wait to begin the training and is in Holding) and then he most likely will go home for 10-14 days of Leave before he heads to his first duty station where he will be an Undesignated Seaman. He will be assigned whatever job is needed within that field and receive on-the-job-training at his duty station/ship for the next 2 years on several jobs before he can "strike" for a rating and head off to "A" School.
If you are referring to the Phases of Liberty while he is at the TSC, the TSC fB page (https://www.facebook.com/TrainingSupportCenterGreatLake) has information in the Note at https://www.facebook.com/notes/training-support-center-tsc-great-la....
You are very welcome.