how to add 40.0 remote to H3 as a second remote?

Just point the remote at the box and hit the Pair/Input button. You may have to be in the Settings/diagnostics/receiver menu before hitting the button but you can pair multiple remotes.
 
It seems like I had to go to the menus pointed out above before I could add additional remotes - I have both the 40.0 and the 52.0 set up now
 
Pressing the System Info button under the front door on the H3 will get you to the proper screen.
 

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