User Help > Working With Documents > Adding Content to a Document > To include an open segment into a target document from the GUI
  
To include an open segment into a target document from the GUI
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This is different from including a new or existing segment into a document. Here you are using the Finder window to include an open document into another document. The target document displays after you complete the insertion.
1. Open the document that you want to include into the document to be selected in the Finder window
2. Select Document > Insert Into. The Finder window opens, allowing you to select the document into which to include the open document. For more information, see Document Finder.
Document hierarchies do not need to be structured alike. For example, you can insert a test document into a requirements document.
3. From the list of available documents by project in the Finder window, select the document into which you want to include the open document.
4. Click OK. The open document now displays as a subsegment reference in the target document.
If you would like to view its entire contents in the Document view, select Content > Toggle Include/Insert to expand it in the current sequence.