Marketing_Guy - 12:50 pm on Feb 15, 2012 (gmt 0)
You want 2 different URLs with the same content (the actual post or posts within that category)?
You can remove the /category and /tag from the URL structure (the Yoast SEO plugin lets you do this). Then your link structure would just be sitename.com/your-category-or-tag/your-post-url.
Not 100% sure what you are asking here.
sitename.com/category/business - a category page that displays all "business" categories"
And you want a secondary category page:
Where "custom-keyword" is defined by you and "shopping" is a category? Or is "shopping" the post URL?
I think tags would still be your best option if you want a custom folder name for groups of posts.