surprise! multi-category for single article is possible @ blogger!

as title

adding tags is just creating new categories for article and thus categorize one single article into multiple categories!

Wow!
what a big surprise!
i have been dreaming for such function for almost a lifetime(or say blogtime?)
and never find out that blogger equiped with it till this moment.

how could someone be so slow...

however,
there might be some inconvenience as well
i assume.