If you need to reorganise Categories to become sub-categories you can easily do this via the ECOMMERCE > MANAGE CATEGORIES area.
The process involves drag-dropping Categories into other Categories, so before you reorganise you should make sure you have created your top-level Categories if they aren't already available.
In our example below, we have our top-level categories and the sub-categories all sitting in the main shopping area.
These are displayed as a vertical list.
Click-drag the categories using the 4-way arrow cursor on the right of the category, indicated in the right screenshot below:
The categories will be dragged and will slightly indent to show it is a sub-category, release the mouse button to drop it in place.
You can see the new hierarchy below, with the top level Categories showing on the website, and on the right the sub-categories are underneath and indented.