There is no ADM file (policy template) that I can find for MS Office 2013 so I can't figure out how to get the ADMX files imported to create GPOs.
Any help would be greatly appreciated.
There are no ADM files for Office 2010+, you must use the ADMX files. It's usually easiest to place them in a Central Store for Group Policy Templates
Populate the Central Store with ADMX Files
There is no user interface for populating the central store in Windows Vista. The following procedure shows how to populate the central store using command line syntax from the domain controller. To populate the central store:
For example, to copy all United States English .adml files, type the following: