How do I plumb LP gas lines for multiple things? Tiki torches, grill, smoker
You are really asking a flow question.
How many CFM (cubic feet per minute) does a given size pipe supply.  The upper limit will be the meter capacity/ pipe size from the street.  

Each device has a max flow rating.  Add them up and compare to the size piping you are planning to use.  Increase the pipe diameter as necessary (up to the size coming in to the meter.