Does anyone know how I can set up a section in my form that looks like this?

The widget shown in the screenshot you share is either the Appointment Slots widget, Ticket Purchases widget, or the Gift Registry widget.

You may refer to this guide to learn how you can add a widget(s) to your form — How-to-Add-a-Widget-to-your-Form

Feel free to contact us anytime if you have other questions or concerns.