step 1: Create a Taxonomy Structure.

step 2: Create a Menu Block as Same as Taxonomy Structure.

Step 3: Add the Menu path as respected to the Taxonomy term path( taxonomy/term/term-id ).

Step 4: call menu block respected resin.

for simple normal menu structure won't give you the Drop down style, for that you need to cal the menu block in Superfish/Nice menu style.

nobody click here