Chord progressions in piano roll?

[spare dew]

I see all of these people making fire progressions in piano roll by just selecting the stamp thing. I'm not sure how it works, i do have knowledge of music theory i just want to know how to make these chords efficiently this way, any advice and or videos to watch?

[restive stone]

Stamp thing ?

[limber herald]

If you know theory you can just build the chords yourself