A primary file can have as many people linked as necessary. In order to undo this link, just select the "Unlink" button that the coordinator can see next to the person in the file:

Any registration made in the name of this detached person will remain on the file, as at the time it was registered it was part of it. If the person was linked by mistake and you also need to transfer their records to another file where this person is currently, you must use the specific option to transfer actions, demands, problems, resources or procedures.