If you are using the ScheduleOnce connector for Outlook with an Exchange server, you can use the Exchange resource calendars for resource scheduling. Please note that Exchange resource calendars are not yet supported with conditional booking. This will be added in the coming months.
To use the Exchange resource calendars for resource scheduling:
Ensure that your Exchange Administrator grants you full read/write permissions to the resource calendars you need to use.
Add the relevant resource calendar(s) to your Outlook Calendar.
In the ScheduleOnce connector for Outlook, click the Settings button and select the resource calendar(s) in the Calendars step. Complete the wizard. The connector will perform a sync with ScheduleOnce.
In your ScheduleOnce account, go to Setup -> Booking pages. Select the Booking page that you want to use and configure the resource calendar settings in the Associated calendars section.
Follow the instructions in the Resource scheduling article.