How do I create submasters for features built into moving fixtures?

You may not be able to quite achieve what you are after as you'd be more likely to control those sorts of things from the encoders.

The normal thing you would do with subs is record a number of channels and specific parameters into then so a command like

Group 200 Red Record Sub 100

which would record just he red value for the group into the sub.   So you could potentially record your rotation into the sub which if it was set proportional then as you moved the link fader up would apply that % of the value recorded in the sub to the group. 

If you are actually wanting to make it so you can select channels and then control just them, thats probably harder.  You might be able to do a trick with an absolute effect that had just one step in it wit the max rotation value, a very very long step hold time and a size fader.

This is close, but not exactly what you’re looking for:

When you record an additive submaster, you’re defining the upper limit of the output when the fader is at full, but the lower limit will always be zero. With Rate and Size on effect subs, you can also define the lower limit, but it must be a positive number. There is no way to have the lower limit be a negative number. This is why putting focus parameters on submasters never really pans out as well as you hope that it will (ha) - those parameters need negative numbers to reach their full range.

Further, rotation of image parameters like gobos or prisms typically don’t use negative numbers. Rather, they’re a combination of, say, a Gobo Mode parameter and a Gobo Rotate/Index parameter. Gobo Mode is like the transmission in your car when you shift between Drive, Neutral, and Reverse, and and Gobo Rotate/Index is like the gas pedal; Gobo Rotate/Index needs a user-defined positive value, but depending on the Gobo Mode, it will either spin the gobo forwards, backwards, or keep it stationary in a particular orientation.

If it were me, I’d record a sub with Gobo Rotate/Index at full and then assign the bump buttons to macros that set the Gobo Mode to Rot + and Rot -. If you wanted to smoothly transition from a forward spin to a reverse spin, you wouldn’t be able to move the fader from full, through zero, and into a negative rotation, but you could bring the fader down, click the bump button that changes the Gobo Mode, and then bring it back up to achieve the same effect.

Thanks Cody!  I appreciate the analogy as it really helped me to understand the order of how its functioning, but I am still running into some issues.  I was able to record the forward rotation at max speed to a sub-master, but when I start to bring the fader down, the rotation doesn't slow down and it stops completely around 56%.  I'm wondering if I need to change the fader from an additive fader to an effect fader?

Interesting. What color is that parameter when it displays at 56%? Yellow is submaster data, so if it's not yellow, it's coming from somewhere else. Blue, Green, Magenta, and White are various types of cue data, Gray is a home value, and Red is manual data. 

Couple things which might help--

The current Eos personality for the chauvet maverick mk II profile appears to contain an error for the Beam FX Index/Speed parameter--it's set for snap, which prevents it from ramping.  Go to patch, click the softkey for Fixtures, select the profile, and clear the checkmark in the Snap column next to Beam FX Index/Speed, then save the changes.

There are also a few ways to get a slider to ramp across a full range from negative to positive values, although they're somewhat kludgy.  

If your sub is set for restore to background (which is the default), the bottom of the slider will be whatever that background value is.  So to get the behavior you want, you could record the rotation speed at full reverse in a cue or in a second sub, then record your working sub with the rotation speed (and nothing else) at full forward.  The slider of the working sub should now give you the full range.

Another fancier way would be to record a special cue list just for this purpose--the first cue would contain only the desired channels and parameters set for full reverse speed, the second cue recorded at full forward speed.  Set the cue list properties as a manual master with back from 1st and go from last set for wrap.  You can also set that cue list's parameter and channel filters to make sure you don't record anything else into it accidentally (or more precisely, if you do it won't play back).  Assign the cue list to a fader and voila.

A third way would be to re-assign the user values in the fixture profile so they aren't negative.  Then you can have 0 be full reverse speed with everything ranging up from there, which would let you use a sub without the requirement for having a background state.