I want to create a BSD pseudeo-terminal such as /dev/ptyp1 & /dev/ttyp1 but there are no /dev/pty files??

Can anyone tell me how to create/setup the pty files please. I know that /dev/ptmx is the master clone device and /dev/pts the slave device. But how do I create the needed pty files in order to get my pseudo link to work.