In Flex, you can add services only to a created and confirmed booking of a space that has these services available. Should you require something specific, search for a space that has the needed option available and book it.

Once the booking is created, you will see the available options to order services (resources or catering) for the room in the booking confirmation popup. Or you can add resources (hearing aids or presentation resources) when editing a booking.

Upon selecting an option, you can decide what resources is required and click Update Booking.