Adding domain choices to a new field in a feature class

Question

I have added a field to two news feature classes - one of the fc's is in a dataset and the other is in a database in the SDE. The new field, in each fc, needs to have three domain choices, seen in the image in the Coded Values section.

But the choices that appear in the table with the dropdown arrow are , Legacy, OneFiber, and OneFiber.

When I access the Subtypes tab in the feature classes, I can't do anything because it is completely greyed out. How can I add these choices? Edit: I have now run the Create Domain tool and the Add Coded Value to Domain tool (image):

But the Assign Domain to Field tool failed. I think the problem is that I don't know how to create more than one value choice for the domain.

Answer 1

I believe I have discovered the solution. The field I assign the domain to apparently needs to be large enough to accommodate all the characters in all the choices combined, instead of just large enough to accommodate the largest value. I needed to run the Add Coded Value To Domain tool once each for each value. Then I ran Assign Domain to Field and all the value choices now appear in the dropdown menu of the field.