Creating a Link to an Existing Document 
Use
As well as
copying documents in the Documents substructure, you can also set links to documents that are stored on a local drive. Copies are standalone documents, which are independent of the original. When you work with links, however, you connect to the same document from different places in the Q&Adb and edit the original centrally.Procedure

Projects is the standard directory for linked documents in the Documents substructure.