I am skinning up a website and other things in Photoshop but I am finding the PSD taking a very long time to load/save and I'm wanting to split the PSD file into several files.

I've done this, but sometimes I need to adjust one thing and I have to change every PSD file so that the entire project is consistent.

Ideally, I'd like to be able to create a master/detail (or a template) structure using Photoshop.

What is the best way to achieve this goal?

Thanks