To export one sequence from an alignment select the sequence in the sequence list or in the sequence area and use the Export->Save sequence context menu item. The following dialog will appear:

     <img src="/wiki/download/attachments/7667725/Exporting Sequence from Alignment.png"/>

Here it is possible to specify the result file location, to select a sequence file format, to define whether to keep or remove gaps (‘—’ chars) in the sequence and optionally add the created document to the current project.