Other than responding to requests from the parliamentary budget officer for information, as set out in the act, there will be no involvement of Treasury Board. The only involvement, really, of Treasury Board at that point would be what it does for all of Parliament, that is, simply being the conduit for tabling the budgetary requests through the estimates process—and that's it.
The only ongoing role beyond what is envisioned by this is the same as that set out for all departments, which is to respond in a timely manner to any requests from the parliamentary budget officer for information relating to the economy or finances of the country.