Click on Collapse to view all subdocuments as references or Expand to view the entire contents of subdocuments within the master document. When the subdocuments are collapsed it is easier to rearrange documents within the Master document. However, many of the toolbar buttons are only available when the subdocuments are expanded. Make sure that subdocuments are expanded before continuing with these notes. Select the heading and text in the Master document view that you wish to make into a subdocument Click Create Subdocuments button on the Outlining toolbar.
Word displays a box around each subdocument and displays a subdocument icon within the box.
To view the subdocument file in a window of its own, double click the subdocument icon alongside the heading. You can now add to or edit the document. If you close and save the Master document at this point, the new subdocument will be automatically named with the first 11 characters of the subdocument's heading. When you open up the Master document, all changes to subdocuments are updated in the Master document. In Outline view, click the subdocument icon for the subdocument you want to remove.