Import and Export code

Hai can any one help me in this matter, my company has the import and export code from the Karnataka state and our Regd. office also there  now we want to shift the regd.office from karnataka to andhra pradesh and also we want to change the import and export code from karnataka to andhra pradesh can any one help me what is the procedure to transfe import and export code from one state to other state