Hi Fazil,
You need to enter XXXX at the place of user ID and rest of the stuffs would be as usual.
So in your case as well, it would be: p:CN=<XXXX>OU=<SOME_DEFAULT_VALUE>
Can you see the snc formats from any of the system, just copy the entire format and replace <userid> with <xxxx>
Let us know in case of any issues.
Regards,
Ameet