You can selectively choose multiple travel reservations to export or delete.
In order to enable multi-select, click on the multi-select button located at the top-right of the event Travel Reservations tab; when the checkboxes appear (to the right of each travel reservation), choose the reservation(s) that you’d like to export or delete. Then, click on the “Bulk Action” dropdown button and choose the action you’d like to apply to your selection.