Network Dependency Analaysis

I am brainstorming a way of showing milestones dependencies in a set of projects.

The simple example is:

Program Project Milestone

A,W,W1

A,W,W2

A,X,X1

A,X,X2

B,Y,Y1

B,Y,Y2

B,Z,Z1

B,Z,Z2

I would like to visualise in a network like this:

then..ideally...if i selected anything connected with the first program (A) then i would see:

I then want to extend it to visualise a set of Dependenicies, so I can do some impact analysis.  If i select ANY kind of object...what are all the objects connected with that.  Does anyone have any experience with that or suggestions.  I have tried 'network' in the marketplace but can't get anything working quite right.