Do you have high-level educational resources on developing your relationship with PMs?

A great business resource on developing XFN relationships is the book "Five Dysnfunctions of a Team" by Patrick Lencioni. Its an easy read and its scalable to all relationship building in your organization. If you can establish trust, you can have conversations and meetings with productive conflict that will make it easier to achieve buy-in of various ideas which will help keep people accountable and ultimately drive results. But the book is a much better blueprint than that 30 word sentence above.