How plot the sum of tags from two different PI Servers in PB

Hello,

I´m trying to do a live value plot of the sum of 8 signals in Processbook, problem is 5 are stored in one Server and 3 in another one. I´m able to create and plot 2 PI Calculations datasets: one for the 5 tags in server1 and another for the 3 tags in server2 but I´m unable to add all 8.

Using excell and ODBC I´m able to add all 8 but only for historical data, not a live value trend like I want.

Does anyone know how to do this?

Regards

Rafael