
In the following report, all of the inner dimension
member lists are repeated in all occurrences: Revenue and COGS, Act2001 and
Act2002, and Jan and Feb. This is called a symmetric report.

An important feature of the EPM plug-in is that the inside members do not have to be identical repeated sets of members. The axis can be asymmetric like this:
The months in each grouping above are not identical, but it is a valid report. This asymmetry is very common once you start using the following features: delete empty columns, delete Microsoft Office Excel columns, asymmetric expand or collapse.