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)
Examples
Creating totals to be used calculate averages using the DIV operation
DIV(ADD(Tag,Tag,Tag),Tag)