If you create a placetype you can inherit the member list of the master place. Every new place created with this placetype will then have all the members of the master place included.
However there is no official way to change the member list later. Refreshing the placetype from its master place will NOT change the member list of the placetype even if you have changed it in the master place itself.
This is currently working as designed and should prevent unwanted access to new places.
Although there is no official way to modify the member list of a placetype later, I have described an unofficial and unsupported workaround in that article.
Quickr (Domino): How to modify members in a placetype?