Reference a Data Type's column name

I have a data type that has multiple columns with dates. Each column is a different step in a process. For example: Start, Stop, Suspended etc.

I have a second Type created that is a Comment. I create new comments based on a comment button that sits next to each date field in a repeating group. I can save the comments with their dates but since the name for the date is the name of the data type’s column, I cant reference it. I can when i search through the dynamic data, but there is no way to just use that text.

Any ideas?