Users who are part of the same company have a shared folder in which they can place maps. First create a map in your own personal folder, and then publish it once you are happy with it. If a map is published to the 'Company Maps' folder then its dataset is also visible in the 'Company Datasets' folder.
Click on the checkbox in the top left corner of the map summary (in Thumbnail view).
Click on the checkbox on the row within the table (in Details view).
A new sub-menu will have appeared at the top left.
The publish button is on the new sub-menu at the top left.
A confirmation box will appear. Click OK to publish the maps otherwise click cancel.
The maps will no longer be visible in your personal folder.