Seat Lock/Training Freeze question:

If a person incurs a 2-year seat-lock due to bidding a different a/c on this next AE, then a new category opens (i.e. DTW 350A/B) how does bidding the new aircraft/category affect the current seat-lock? Is it an additional 2-years, on top of our current freeze or does the person just incur a "new" 2-year freeze? Thanks in advance.