Update particular resources

Yes, you can use row.update() method:
https://api.daypilot.org/daypilot-scheduler-rows-update/

Thank you. Is there an equivalent method for adding single resource? I found only for removing: DayPilot.Row.remove()

Unfortunately, there is no method for adding new rows. I recommend adding the new resource using the resources[] array.

Adding a new resource through a direct method would only be more efficient if the new resource were added at the bottom. In all other cases, it would require a full update anyway.