Hello.
1) In the Booking Calendar Free version you can only make bookings only for “pseudo time slots”. You can activate “unlimited bookings” (days always free) at the Booking > Settings General page in advanced section, and to use some selectbox at the Booking > Settings > Form page, where visitors can select some option – your time-slot. But it’s will not prevent from overbooking.
2) The ability to book for the specific times only possible in the Booking Calendar Business Small / Business Medium versions (and in higher versions for booking resources with capacity =1). Please note if you will make the booking for the specific timeslot, this timeslot become unavailable for the other visitors for that selected date in current specific calendar.
You can configure the timeslots selections on the Booking > Settings > Form page. Please use the “shortcode generator” on the right side of that page for the correct generation of the shortcode.
You can use one”timerange” (timeslots) or “start time” and”end time” selections or”starttime” and “duration”of time selections shortcodes or even start time and end time entering shortcodes. Please read more about the booking form fields configuration here http://wpbookingcalendar.com/help/booking-form-fields/
You can test the bookings for the specific time-slots in action on the live demo of Business Small version (which is configured by default for the bookings of specific time-slots) here: http://bs.wpbookingcalendar.com/ Other live demo you will need to reconfigure.
Kind Regards.
