Hi Pheobesmum,
Welcome to Rootchat.
I can't answer your query ,but this link (on this board) will maybe give you some ideas.
http://www.rootschat.com/forum/index.php/topic,158637.0.htmlBob has put the links to other peoples queries.
I see you have 4 separate trees , now you can put all the names into one file in any programme ,but of course without a Root name (such as yourself or other blood relation) they won't actually "link"
I have a number of separate families who are not related to each other but have a vague connection via myself /Husband /grandchildrens other ancestors, all on one file and separate files also for each tree
Equally you can also open many differant family files.
You can use any storage medium to show your family but they must have a Family Tree programme to open your GEDcom files
I'm sure you'll be able to find answers on this board
Spring