Not sure if this well help but here's what the NPC "green book" has to say... BTW if your chapter doesn't have a copy it should and can be ordered from the npc web site (
http://www.npcwomen.org)
Establishment of a College Panhellenic
When the first NPC fraternity is installed on a campus the fraternity shall notify the NPC Area Advisor, ...
When a second group is installed on campus, the first group shall notify the NPC Advisor to New College Panhellenics so that preparations can begin for establishing a college panhellenic association.
The first group has the responsibility to iitiate the organization of a college panhellenic.
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ok so this sounds to me like if/when a new NPC is installed, your chapter is required to initiate the formation of a college panhellenic. You and the new NPC chapter would be required to belong. The local might or might not be a full member depending on the bylaws written and their choice. I've seen cases where locals did belong and participated in formal recruitment and cases where they didn't.
My suggestion is to find out who your NPC area advisor is - here's the link to the npc advisors list.
http://www.npcwomen.org/college/c_advisors.php
or your national headquarters can tell you who.
on the recruitment question
again I think this would depend on if the local joins the college panhellenic or not. If they join, they would be bound to any recruitment rules setup by the college panhellenic. If they don't join then they wouldn't.
BTW .. .my understanding is that the only requirements for recruitment by NPC is 1) the use of the preferential bidding system, 2) that no chapter offer bids during a college recess (except for a formal recruitment period just prior to the start of a term) and 3) no men and no alcohol during recruitment.
The college panhellenic determines the other rules and regulations for recruitment.
Hope this help...