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As of now, these features not available in the latest version of PI Vision. But this will be included in the next release and already development is going on, check the below links for your reference,
Actively Updating attribute values while dragging a trend cursor is planned for the PI Vision 4.x release in Q4 2018.
The ability to add multiple trend cursors to trends on PI Vision displays is planned for the PI Vision 4.x release in Q4 2018.