To move Bars or Containers between roadmaps, you will need to use the Move Lanes feature.
Moving a Lane to a new roadmap includes all Bars and Containers placed in that Lane. If you want to move Bars but don’t wish to move an existing Lane, you can simply create a new Lane to be used for moving your items. Just drag the Bars you want to move onto your new Lane, move that Lane to the new roadmap, and from there you can begin placing your Bars where you need them to be.
To move a Lane to a different roadmap, just click on its title, select “Move to” and choose the new roadmap.