Only info I found was this:
http://forrst.com/posts/Node_js_Jade_Import_Jade_File-CZW
I replicated the suggested folder structure (views/partials) But it didn\'t
I think partial rendering is done in express, so you will have to snag that code or write your own.
I have my own helper class for jade rendering with partials that you can use or get some ideas from here, (it's using Joose and Cactus)