Wiring Diagram for pair of switches with dual 3-way switches

I originally had a light operated with a pair of single 3-way switches. Not a problem understanding how this works. I am replacing these 3-way switches with a combination switch from Leviton which has a pair of 3-way switches on each switch so I can operate the original light and a new fan seperately from the original boxes.

I would like to use the common feed and the common neutral for both the light and fan. The 1st switch receives the 2-wire feed, the 2nd switch receives the original 2-wire light feed, and there is a 3-wire between the two original single 3-way switches.

I realize I will need to add wiring from the light/fan fixture to the 2nd switch and most likely need to add between the 3-way switches but can someone provide me a diagram that would show how this all gets wired once I add the pair of new combo 3-way switches?

 

If I understand correct you want to add 2 new 3ways to the existing boxes to control a new fan.
You will need to add a 14/3 cable between the switches and a 14/2 from the 2nd switch to the new fan. Wiring will be an exact duplicate of what is currently there.
If your circuit breaker for this circuit is 20 amp use 12/3 and 12/2.