how to create in proc

[Srinivas Surabhi]

hi all,
   
   i am new comer into the world of linux.i want to create a
subdirectory in /proc directory. Already i know have to create 
a file in the /proc filesystem.

   So kindly help me, what are the system calls/fuction calls to be used
for the creation of sub-directory in /proc directory.

thank u
srinivas