No, there is no way for a student to add a second destination to an actively running pass.
Is there a workaround?
One option would be for the adult to simply “END/KEEP” that student. That adult could then add a comment to the “ended” pass, letting the original adult know that the student will be going to another location. The adult or student then creates a new pass to the new location.
Alternatively, if this is planned from the onset of the pass, the adult creator of the pass could add in the Comments that the student has permission to travel to the next location. The comment would be “publicly displayed” on the pass should anyone question the student in the hall.