You can do this a few different ways. After generating the box plot in graph builder you can right click the graph, select add, then select points. Alternatively, you can add the points on top of the box plot by dragging the icon with points (in the pallete above the graph) on top of the graph. Dragging a visual (rather than clicking it) adds the visualization to the current plot (rather than replacing it).
I hope this helps,
What if you have multiple sub-categories per main category like below? How do you get the points map to align with the box plot rather than just a jitter over the entire category?
I've been trying to figure this one out and starting to think JMP can't do this yet...