Existing Parallels Partners with active multi-license support contract can file a PBAS support ticket here
This is the most valuable resource for you to start with. Access PBAS product documentation here.
Get the support you business need — 24/7! Parallels provides support around the clock so you get the answers you need when you need them. Software support, product installations and upgrades, and administration services are all available from Parallels. Purchase a support ticket online here
Parallels Support Portal provides complete information regarding support services for all our products. The Service Provider Quick Start Guide contains a process overview, support ticket requirements, and tips and tricks that enable the Parallels Support Team to efficiently and effectively resolve your support request.
The most effective way to gain in-depth expertise in administering and supporting Parallels products is by taking Parallels training courses. For your convenience these instructor-led courses are available both onsite and online.
Connect with other PBAS/Plesk/PVC powered providers in a Parallels Forum
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To facilitate your long term planning details on lifecycle policies for Parallels products are available at http://www.parallels.com/support/policy/lifecycle/