We are managing one project with three backlogs (boards) and two teams. Two of the backlogs (1a and 1b) are being done by one team (team 1). I created Sprint from one of the backlogs (1a), so we can put issues from that backlog into Team 1 - Sprint 1.
My question: How do we move issues from backlog 1b into Team 1 - Sprint1?