The Dynamics GP Support and Services Blog explains Adding the Developer tab in Microsoft Word after installing the Microsoft Dynamics GP Add-in for Microsoft Word.
Adding the Developer tab in Microsoft Word after installing the Microsoft Dynamics GP Add-in for Microsoft Word – Video – Dynamics GP Support and Services Blog
Install, Upgrade & AdminMicrosoft & the GP Ecosystem
Archived post from 2011. Dynamics GP and the links it points to have changed since; check current documentation before relying on version-specific steps.