I am struck at some areas i need your help
1.How to insert pre heat button and pause at the start of my cutting .
2.how to customize mach3 screens for flame 3 axis & 5 axis(bevel Feature).
3.how to add buttons in mach3 with customize output.

Have you had any luck on this.  We have a peirce delay on our screen that we bought from machmotion. What kind of setup do you have for your bevel cutting?

I think in order to do bevel cutting with 5 axis to tilt the torch you will need a 5 axis CAM program as Mach 3 and 4 are just machine controllers that can do 5 axis motion if the G-code tells it exactly what to do.  Lots of axis coordination needed to go around a corner while cutting a bevel.  A five axis Cam program though is BIG bucks.

Yes the best way is a cam software we use Sigmanest for our home built 5 axis water jet.  The big things is needing to use inverse time to get the feeds to work and 3 years until Sigmanest to add that to their software

RDR,
I'd love to see pictures of your home built water jet.  First one I have ever heard about.