Multi-level member levels

If you want to have the levels display incremental levels, I think you would need the pro version.

If you need each level to be independent of each other, you can use the Custom Capabilities to name various “levels” the way you want, and you can then create any number of them.

Otherwise, maybe you can use the levels, as per the free s2M and add the a, b, c as custom capabilities.

It all depends what you want to do with those separate levels.