Devon Southall has a great look at Making a new Navigation List in Builder for GP 2010. If you’ve wanted to get started with Navigation List Builder here is your chance.
Making a new Navigation List in Builder for GP 2010 in Dynamics GP
Off-Topic & MiscellaneousGP 2010
Archived post from 2010. Dynamics GP and the links it points to have changed since; check current documentation before relying on version-specific steps.