To be eligible for the Party VIP program you have to generate at least $1,000+ in rake a month. You then have to email at
vip@partypoker.com and talk to them about a deal. Alot of negative posts have been about this recently so check them if you want.
The Party VIP offers are straight from Party. If you are looking for a Party approved revenue sharing then you can get them through affiliates. I have affiliates who are offering this.
I hope this helps you. Let me know if you need any more info.