Take an answer to one question in a roster to another

Dear All,

Is it possible to take an answer to one question in a roster with a source list question.

For example I have a list question: which are the activities you do in a day. The list question is then followed by a roster with two questions start time and end time. For the second activity in the list question the end time of the first activity should become the start time in the second activity. Is that possible. Please let me know how we can do that.
If that is not possible will it be possible to add a validation in the start time of the second activity if the start time if the second activity is different from the end time of the first activity.

See the Time Use questionnaire module in public examples:
https://designer.mysurvey.solutions/questionnaire/details/702bef443dfb4fc8bd8c754612590875