Hi All,
I’m working with a client on defining data elements and disaggregations, and I have a question for anyone with experience on such issues. The requirement is that a certain data element has disaggregations, call them (A, B, C, D). Then A is further disaggregated into A1 and A2. I’m wondering how best to model this. Possibilities include:

Make a single disaggregation category whose options are (A1, A2, B, C, D). Then if I want to see the total for A, I could define an indicator for the sum of data element:A1 and data element:A2.

Define two categories, one with options (A, B, C, D) and another with options (A1, A2, ). Then define a data set section and use “Section grey field management” to eliminate all combinations except (A:A1, A:A2, B:–, C:–, D:–).
Model 2 seems somewhat contrived for this scenario, so I think model 1 is better. Are there any other models I should consider? Or any other wisdom on this?
Cheers,
Jim