Tim,
I do something similar with our membership. On the Integrations / SQL Actions for the specific plan, I set default values for a user when they Activate (New User). In the SQL Action 1 area and in the Activation box, I have the following SQL code:
UPDATE xxxxx_comprofiler a
SET
a.cb_role = "None",
a.cb_ccph = "No",
a.cb_agencytype = "None",
a.cb_mbranniversary = CURDATE(),
a.cb_membershiplevel = "Government Individual",
a.cb_mbrtype = "Member"
WHERE
a.user_id = [user_id];
Make sure you have the CBSubs SQL actions installed in Community Builder and they are published. Hope this helps.
Thanks,
Joe