It's not currently possible to impose your own tags, but you can
filter based on the participants' responses to pre and/or post
survey questions. If you were gathering that information (e.g. job
type) via a pre/post survey question, the result segmentation would
therefore become quite straightforward. You will find that
functionality on the Participants tab in the OptimalSort results.
You can also manually select an arbitrary subset of your
participants and filter your results based on those.