Creating a link to a document in a SharePoint library
By default creating a link to a document is disabled in SharePoint libraries. I have enabled this on several libraries recently as it has helped reduce document duplication. This is how to enable document links:
1. Navigate to the required library and from the Ribbon choose Library Settings
2. Choose Advanced Settings
3. Select Yes to allow management of content types and click OK
4. Under Content Types click Add from existing site content types
5. From the drop-down list choose Document Content Types, select Link to a Document and click Add. Then click OK
Now, when selecting New Document from the Ribbon I have the option to create a link to a document, as shown below.