I'm trying to add a Domain to a Field in a Feature Class in ArcGIS 10.2. I'm Following the Instructions found in the Official Documentation for Associating default values and domains with tables and feature classes and Creating subtypes. The issue I'm running into is that, after successfully creating a new Domain in the Enterprise GeoDatabase containing the Feature Class of Interest, I cannot Create a Subtype in that same Feature Class. Using the Catalog navigation tree, I right-click on the Feature Class, select Properties, locate the Subtypes tab, then Attempt to Add a Subtype, in the service of Adding a Domain. The Subtype Field and Default Subtype Fields are 'greyed out'
AND whenever I try and add text to the Subtypes files, the Domain box automatically opens. This image indicates that I have properly created a Domain prior to Engaging with this Workflow.