Part rows selected under Include will be part of a new run. New part rows are always selected as default. Part rows from previous runs are not included when restarting the CDT. This may cause you trouble if an existing part row should be run again. That row must then first be selected in this column.
The reason for using the Include field, is that new and existing rows are mixed in the window. Existing reservations shall not be purged and run again just because another row is added. That would mean unnecessary processing time, and the data on existing reservations could be changed by mistake.