Well Blogger Does Not Support Hierarchy For Labels, Which is provided by Wordpress, But Here is a Hack to this Problem.
To See What I am Saying , Just Go to Sample Blog at Address:
Http://wall69.blogspot.com
You see there are 3-4 Categories, and then In each Categories there are Sub-Categories.
Like-- SeriesName-> CharacterName
Now How to Implement. You Can Try Clicking on Labels and then See address bar you will see the difference, You can figure it out how i implemented it. But if you cant just let me know, Comment here i will post Solution here, It not like i dont want to share but i dont want to write which is not worth of reading, to write about it would take, 100-150 lines to explain. So i decided i will write later, when i will be free or or someone ask earlier. Some othere people might have done it, i dont know. Comment, I will surely reply.
