Melissa,

Have you ever used a responses.xls file before? One possible approach would be to use scale response items where the labels would be determined dynamically during the session (e.g., "holidays to spend with friends", "holidays to spend with family"). You could use initial fill in the blank items to capture the participants' "categories". Using the responses.xls file, you could skip them to the sorting task if they enter "done". After that, you could assign those fill-in-the-blank responses as labels for the scale responses. You could also use multiple response items if you wanted subjects to be able to check more than one category. Just a thought.