I am using blogger but on the sidebar i cant figure out how to make the blog archive into a catagories of different subjects than when you click on the subject have it show different pages in that subject. Anybody know what i mean like this

• cats
• dogs
• ferret s
• horse
• lion
• meerkat <---- than person clicks meerkat and than on the sidebar it goes

• meerkat food
• meerkat training
• meerkat breeds
• meerkat cost
• meerkat manor

So can anybody help me with this or direct me to a website that is good at explaining how to cuztomize your sidebar like this ?