First put all the documents in the same folder.



Then in the outline document, select the headings and then link to the right document.

If you need to deliver the file, make sure you must send the whole foder.

No need for a Master document here!

Open the file you want to link TO,
Set up a Bookmark at the place you want to link to
Open the file you want to link FROM
Setup your hyperlink - link to, existing file or webpage
In the menu, choose the file you have made the bookmark in
To the right of that, choose Bookmark
In the new window, choose the bookmark you made

The only thing to remember now is that if the linked files move folders, the link stops working, so you need to keep them in the same place all the time.