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Thanks for posting on PI Square.
Unfortunately, no. In order to trend values in the trend object, you must have a data item that is either: a PI Tag, AF Attribute, Element Relative AF Attribute, ODBC connection, or PI Calculation.
How complicated is the VBA calculation? Is there a reason that you need to have values to be calculated in VBA as opposed to the native PI Calculations in Processbook? What is the calculation's end goal? Perhaps we can translate it into something that a Trend Object can accept?