The multirange.add() method adds a new time range to the current selection.
DayPilot.Scheduler.multirange.add(selection)selection (object) - selection segment to add
The selection object supports the following properties:
start (DayPilot.Date or string) - segment start
end (DayPilot.Date or string) - segment end
resource (string or number) - segment resource ID
dp.multirange.add({ start: "2025-01-01", end: "2025-01-05", resource: "R1" });Time range multi-selecting [doc.daypilot.org]