I got fit to my bike but now want to transfer the setup to a beater bike I got. Is there a simple way do do this with out going through trial and error and geometry?

Assuming you will be using the same length cranks, same pedals, saddle, bars and levers:
With the bike on a level surface.
1. Measure along the seattube from the BB axle to the top of the saddle to find the saddle height.
2. Drop a plumbline from the tip of the saddle and note how far back from the BB axle it intersects the crank to find the saddle setback. Use a level to check the saddle abgle, if you don't have it perfectly horizontal.
3. Measure the distance from the tip of the saddle to the bars. it doesn't matter whether it's the rear face of the bars, top centre, etc, so long as you measure to the same place when setting up the new bike
4. measure the handlbar drop - there are various ways, but the most basic and reliable is the measure from the saddle to ground, then bars to ground and subtract.

when setting up the new bike, set the saddle first, then the bars. If you measure everything accurately enough, then you should be able to get the same position. Some people are obsessive about having everything exactly the same on all their bikes, others are more tolerant of slightly different riding positions, if you're with the second group, then don't worry too much about everything, as long as it's all within a couple of mm of the original bike then you'll probably not notice the difference.

IMHO, foz has it pretty much right. When doing this type of measurements, I find it helpful to tighten a toe strap round the front wheel and the down tube. This holds the front wheel straight and makes measurements easier and more consistent.

All good advice.. Take your time & do it right.

The seat, pedals and crank length are the same so that's a start and I think I can work around the stem/bar differences.

OB

when setting up the new bike, set the saddle first, then the bars.

Very good post foz... you nailed it.