Woocommerce Taxonomy

I have a found a few things I would be happy if someone could shed some light.

I found that, when creating categories, when i create them without “Parent” which means every category stands on its on, and use them as link navigation for the website, the urls are shorten which is good for SEO.

On the other hand, If i create these categories and used some as parent categories, when i want to use those subs, i end up with very long urls.

Now this is the issue I am trying to find out, When I create these categories without “parent” and later on return to give the very same categories a parent, the url does not change which means I am left with short urls even though they are linked to a parent category. The parent category does not show up which is good for SEO.

Is there anything wrong if i decide to create my categories without a “parent”, finish setting up the website then return to them and drag and drop various items under a relevant parent category?

1 wwww.example.com/product-category/camera – no parent category
2 wwww.example.com/product-category/electronics/camera – With parent category

But note that When I return and create the parent category while I have my navigation set up already, “Camera” i end up with a url that has no parent, see below

3 wwww.example.com/product-category/camera why is the parent category (Electronics) not converted automatically despite the fact, camera has been placed under electronics?

The page I need help with: [log in to see the link]