Great enhancement that I didn't know I needed.
I haven't had a chance to work it yet but agree, this will be HUGE in organizing my RM rules.
Awesome, already started using it. Now I don't have to use the RM Title for Category:Subcategory
Thank you for posting this!!! Downloading it specifically to get that feature!!!
Ok, I created a new group.
I drag a rule over the group and nothing happens.
Nevermind, I figured it out. 
That’s what I found 
1 of my C8+'s shows the option but my other doesn't?
Refresh browser page/clear cache?
If that doesn't work reboot hub. I haven't heard previously of it not showing up. Are you sure you updated both of your C8 Pro hubs? 
Both updated and hub rebooted
Well clearly you're lying. 
Hmmm...sounds like a call for Supergopher. @gopher.ny
It doesn't bother me that much as related rules start with a number if thet are related so they're grouped any way
Its available on my C8
Its not on basic rules on either C8+'s but it is on my C8
I'm not sure how it determines which apps to offer the feature for but it must be dynamic because it is available for use on an old community app that I modified to use the parent/child relationship. It's not available on every parent/child app though.
It only shows up when there are 6 or more child apps.
Thanks. I was about to create a bunch of child apps to test if t were was a limit. Good timing. 
Was mentioned in the beta forum.
It didn't show ou on my C8 at first so I created one blank app and it appeared?