Unplanned property omission is only supported for cloud-mode destinations. Unplanned properties will not be omitted when they're sent to device-mode destinations.

You can import events into the tracking from the source schema when you initially create your tracking plan. Also, you can manually add these events by clicking the the (+) next to the event in your source

schema page once the tracking plan has been connected.

When you first create your Tracking Plan, you can add events from your Source Schema by selecting the**Import events from Source** button on the Tracking Plan editor page. You can manually add these events after you've connected your Source Schema to your Tracking Plan by clicking the (+) next to the event on your Source Schema page.