I want to create two separate registration page for vendor and seller but i am not able to add link to go to the other registration page can you tell me how to link my page
I have added the controller vendorregister. php and  but i am not getting how to change the switch case of index page i have added the screenshot of index.php file and  href link in header.php  like in register <a href="<?php echo osc_register_account_url() ; ?>

@hariom singh
I think that is bad and complicated way. It is much easier to add extra parameter to URL and create 2 different forms on same register page.

 i want to disable the post an add for the seller but keep it for the vendor . Is it possible??

Well best way is to add at start of document check if this page is available for person or not.