I successfully created a Main category and a subcategory within that.

My store, however, only shows the main(parent) category, and not the sub.

Shouldn't it do the following?

Category A
Category B
Category C
|_ Subcategory
Category D
Category E

(and so on)

I've read several posts, but I'm not sure what I'm doing wrong.

Does anyone have an example URL that I can review?

Paul