Changing StoreType of a DataCell

The storage type is dependent on how the data was 'created'. Entered manually = Input, posted as a journal = Journals, calculated = Calculation, etc.

So if you want to have a certain storage type for a given cell, I suggest you calculate / enter / post / ... the data accordingly. However, I do not see how this is worth the effort in most cases as you can also just reflect the origin of the data via the Origin dimension, or a common-practice audit dimension.