Resource is taxonomy of
Inventory post type. You can find this here Dashboard->Inventory->Resources. You can add unlimited
payable resources from here. You can set it either per-day or one-time basis. If you set per-day basis then it will allow you to set hourly price for this resource. If you book less than 1 day then the hourly resource cost will be applied. Check this screen-shot to get more idea about per-day resources cost. It also has drag-and-drop sorting facilities.
You can set
payable resources like the following screen-shot.