I need help building a form with choices that disappear when a user selects them.

For example:

We have time slots listed for appointments.

When a user selects a time slot and submits that form that choice is not an option for the next user who comes to the form.

Can we do that?

thanks!

Yes, you can do that here in JotForm. I recommend you using the Appointment Slots widget. 

This widget is perfect for showing your form users what times are available for an appointment. Also, you can limit the availability of the options.

Here's a guide on How-to-Add-a-Widget-to-your-Form.

Hope that helps. Let us know if you need further assistance. Thank you.