Help required for Add on's and rooms..

Can anyone help?

I have just opened a cricket centre (for those who don't know what cricket is - think Baseball) 

It has three lanes for batters to hit. Two of those lanes have bowling/pitching machines.

How do I create a schedule that stops people booking a machine when the two machines have already been booked out?

Any help, appreciated?

Calendar

Appointments per time slot - 3 - accept until fully booked

Resources

1. Lanes - 3
2. Bowling Machine- 2

Appointment Types:

1. Bowling Lane with Machine - required resource
   1. Lanes
   2. Bowling Machine
2. Bowling Lane with Machine - required resource
   1. Lanes
   2. Bowling Machine
3. Bowling Lane without Machine - required resource
   1. Lanes

This is if your bowling machines are moveable to different lanes.

Do not use add-ons - I think that's basically an unlimited resource...

If the machines are permanently in place:

Calendar

Appointments per time slot - 3 - accept until fully booked

Resources

1. Lanes - 3
2. Bowling Machine A- 1
3. Bowling Machine B - 1

Appointment Types:

1. Bowling Lane with Machine A - required resource
   1. Lanes
   2. Bowling Machine A
2. Bowling Lane with Machine B - required resource
   1. Lanes
   2. Bowling Machine B
3. Bowling Lane without Machine - required resource
   1. Lanes