Thanks for reply,
I will be more specific now:
The idea is - user needs to be able to create a post with a few more custom details: category, priority and source. These characteristics are restricted to be of fixed choices (e.g., priority is one of "High", "Medium", "Low").
In the post page, these characteristics should be displayed with a text value and a related color (like "High" and red colored rectangle, for example).
The closest similar view is a bugtracker or Trello I think, but on Plone and customized.
As I understand, it must be smth like a dropdown widget during creation of the post. But I'm not sure where to dig further.