For the scope of this question I am working with SharePoint 2013.
I have a Tasks list that was created with the OOTB (add an app) Task list.
I have a Document Library that was created with the OOTB (add an app) Document Library.
In the document library I added a column that was the type of "Lookup". I selected the tasks list and in this column I have "Task Name". I also included "% Complete" and "Due Date". The fields do show up as columns in the document library.
I then go in to the Advanced Settings for the document library and edit the template. Then I go to the Insert Tab and when I select Document Properties those fields such as "% Complete" and "Due Date" do not show up. The initial "Task Name" is available and I am able to select the actual task; however, these additional properties are not available for the document. What can I do to have these fields show up in the document such that when the "% Complete" is updated in that Tasks list that it will also be updated in the viewable document?
Essentially I am doing what is described here, the only difference is that I am using a lookup column instead of external content http://office.microsoft.com/en-us/sharepoint-help/use-external-data-columns-in-a-word-document-HA102847511.aspx