Sidebar pages and subpages question

Hey,

I’m setting up a blog and I can’t work something out.

I have a page, that has a subpage, and that subpage can have more than one subpage.

So:
Home > Page 1 > Subpage 1 > Projectpage 1
Home > Page 1 > Subpage 1 > Projectpage 2
Home > Page 1 > Subpage 1 > Projectpage 3

Now I want the Subpage 1 and all the Projectpages to show theprojectpages in the sidebar.

However, I do NOT want Subpage 1 to be included in this list. Just the Projectpages.

I’ve tried looking through all the documentation and I just can’t seem to figure it out. Does anybody have an idea how to achieve this?

Any help would be greatly appreciated.