I can see at this time that you do not have a license, and so I cannot provide normal support to you.
If you mean, can you have a form in which the Post Title is in a dropdown list, then, it is possible, but only if you duplicate the post title into a custom field and use that field as the data source for the dropdown.
It is possible using WordPress hooks/functions to make the population of that custom field automatic when a post is saved (which means you would need to go back and re-save any exiting posts).
I am not sure what you then mean by the question about related categories. I would need to see a graphic of the form design you had in mind, together with some further explanation.