Hi Caz,
Mine's version 11, but I think you could still do this in v6 - if not, click on your help? box and look up 'copying/exporting groups of individuals'
This is how mine works:
Select the individual, create a descendant tree or outline descendant tree for him by clicking on one of the boxes along the top of the page, then click on 'File' then 'Copy/Export Individuals', a 'save' box should appear, make a new name for the file and save as 'Family Tree Maker'. Then you can open that file as a new family file. Or save it as a 'gedcom' and you can then send the gedcom off to someone by email.
Hope that helps,
Barbara