cross calculations with BW4 live data model

Hi,

If we have many measures in a Model (BW4 and live), it would be handy to do cross calculations over them, in order to avoid calculating the same thing multiple times. correct?

Lets say we have 10 measures and for all of them we want to calculate the e.g. deltaPY, deltaMTD-PY, in absolute and percentage and some more other calculations.

I understand that cross calculations would be a nice option here. But how to do this with live data? We see no option for this.

Thanks and best

D