automatically subscribe

could you please guide me as how to automatically subcribe members to a certain plan upon registration?
example:
i would like to create a lifetime subscription with very little access to our members area. i would like for the user/member to be automatically subscribed to this plan along with the additional plan they choose (free introductory, or paid). so basically they would be registering for 2 plans on the initial registration.
this lifetime plan will be hidden from the front page because they should be assigned to it without knowledge so they will have a lifetime plan automatically with access to the limitations set within the plan itself (pages, modules etc...)

thank you in advance

CB Auto Actions can do this, but requires a Professional subscription. Alternative is to display the plan on registration page and set it as non-exclusive, default, then hide it using CSS.