4 wire to 3 wire doorbell

[gauder4]

I got a new 3 wire doorbell with no com terminal. My old doorbell had a com wire to make it four terminals. Do I just not wire the com terminal up and tape it off?
I’m doing this to connect a nest hello doorbell. Right now I have it direct connected without the nest chime connector to make the indoor chime work,but it buzzes. Unless someone knows how to get it to work without buzzing with a relay maybe. I don’t know how.
Thanks, Ryan
I just need to get it to stop buzzing and don't know what to do with the com wire. I'm assuming with the 3 wires that I can use the google chime too.

 

[Dennis Alwon]

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