How to Create mount point in Solaris 10

# Format > disk >p > p>3 (30GB)
       4 (30GB) 
       5 (30GB)
than level : press l and continue
check the partition is ok

# newfs /dev/rdsk/c0t0d0s3
# mkdir /var
# mount /dev/dsk/c0t0d0s3 /var

# newfs /dev/rdsk/c0t0d0s4
# mkdir /usr
# mount /dev/dsk/c0t0d0s4 /usr

# newfs /dev/rdsk/c0t0d0s5
# mkdir /opt
# mount /dev/dsk/c0t0d0s5 /opt

Backup vfstab file :

# cp /etc/vfstab   /etc/vfstab_backup

Then add below line in vfstab :
==========================================================
# vi /etc/vfstab

/dev/dsk/c0t0d0s3   /dev/rdsk/c0t0d0s3    /var    ufs     2       yes     –
/dev/dsk/c0t0d0s4   /dev/rdsk/c0t0d0s4    /usr    ufs     2       yes     –
/dev/dsk/c0t0d0s5   /dev/rdsk/c0t0d0s5    /opt    ufs     2       yes     –
============================================================

# dh -h
# init 6
# df -h