Welcome to the forum.

Yes, you can. Type the first chord, then type a comma and type the chord for the second beat. Press Enter. That moves you to the second half of the cell. Type the chord for the third beat and press Enter.

In 3/4 time, the second half of the second cell (beat 4) is not used.

PG Music has a Support tab above, and a FAQ section about BIAB. There is #47 that relates to your question. Go here:
http://www.pgmusic.com/techfaq29.htm#47


BIAB 2024 Win Audiophile. Software: Studio One 6.5 Pro, Swam horns, Acoustica-7, Notion 6; Win 11 Home. Hardware: Intel i9, 32 Gb; Roland Integra-7, Presonus Studio 192, Presonus Faderport 8, Royer 121, Adam Sub8 & Neumann 120 monitors