By setting resources for bookings, you enable your users to have more autonomy over their bookings as they can self-select the resources you have available. 

To create and edit bookable resources you'll need to head over to  Settings > Resources.

Once there, hit the + Resource button and you'll be taken through to the create resource screen and can add the price, and how it's charged, as well as a brief note to help users navigate your booking process. 

One of the most useful functions here is the ability to for you to set how you charge for the resource: 

Per booking - charges for the number of resources in a booking (# of resources = quantity within an invoice). 

Per hour - charges for the number of resources in each hour of a booking (duration x # of resources = quantity within an invoice). This can help you charge more precisely for resources such as projectors or people such as sound engineers. 

Per person - changes the default quantity in a booking to match the number of attendees. This can be very useful for resources such as catering items and chairs.

The resources will then appear for users during the room booking process to add to their booking: