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To use the add Function

ADD(Tag,Tag,Tag)

ADD(Demo-influxdb/DEMO_01TI031.PV,Demo-influxdb/DEMO_01TI032.PV,Demo-influxdb/DEMO_01TI021.PV)

Help Pages > ADD > Screen Shot 2018-05-25 at 10.56.45.png

-The Trends to the right of the tags display the live data of the tag

If your tag is invalad it will display