Every time the subcommittee meets, it has to report its recommendations to all committee members. They must endorse the subcommittee's decision and can make changes to it. The subcommittee's proposals are subject to the full committee's approval and any changes it makes.
It's another way of doing things. In subcommittee, you can do the same things you can do in committee, but if you go the subcommittee route, you have the extra step of adopting the report, as we are doing right now.