How to upload standard parts into windchill which is in the folder & sub folder in a single shot?

I have standard parts which has more than 500 & all the parts places into sub folders .

Like

folder A

    inside folder B

    inside folder C

         100 PARTS

Folder D

   Inside folder E

    200 parts

So i want to know how to upload all the folders into windchill in a single shot into one particular folder inside windchill ?