Firstly you should add secondly disc .The secondary disk is 1GB in this example. 

Run YAST on SUSE  (YAST>system>partitioner):

Create primary partition :

Add new device  in used volume group using add volume

If you want  to grow up an LVM you have to umount that LVM (you can use command)

fuser -km /opt

umount /opt

Resize LVM partition which wanted to grow .

If you see  patition not resized when click to apply as I saw on SUSE 9.3  , you can use this commands:

 e2fsck -f /dev/mapper/vg00-lvol5

resize2fs /dev/mapper/vg00-lvol5

mount /opt

Now  my /opt partition resized :)