How can I define AggregateFunction between Measures and Dimensions in MOLAP SSAS Enterprise?

Good Day,

I am trying to use SSAS Enterprise with automation from the AMO model in order to define a cube where a measure may have a default Aggregation type (for most dimensions) then other AggregateFunctions on other dimensions...

E.G. Patients, can add over regions however not over time, products, formats etc.

I have my C# code automating the AggregateFunction of a Measure, however I'm having some difficulty finding examples of how one would override that AggregateFunction for a measure when the aggregation will happen on a specific dimension.

Thanks in advance!