Step 1: Login to perforce server using super account.
 p4 -p <port> -u <username> login

Step 2: Create a group using following command
 p4 -p <port> -u <username> group <groupname>

Step 3: This will prompt you a form in which you need to add LDAP ids which is suppose to a part of that group.

Step 4: Later you can access of the group in protect table by following
 p4 -p <port> -u <username> group protect
and you can add following lines in it.

read group <groupname> * //...
write group <groupname> * //...

For more information, please refer following url….
www.perforce.com/perforce/doc.current/ma.../cmdref/protect.html
www.perforce.com/perforce/doc.current/manuals/cmdref/group.html