To do this, you must ask your internal Simple CRM manager to go to Administration -> Usage List -> Add Resource
A resource is therefore a work resource: a vehicle, a meeting room, a room you rent, a hotel room, etc.
You can then allocate this resource via an Interaction.
For example, if Mr Dupont rents room 404, you create an Interaction, linked to Mr Dupont and the user "Room 404".
So in the rental schedule of the room you see this rental.
Same for a vehicle, etc.