Yes, that is what LVM does. You can add new disks to an LVM volume. In your /etc/fstab file, insead of a disk partition device like (/dev/sda2), you will use the LVM device name.
example from Fedora Core 6 Laptop:
Code:
/dev/VolGroup00/LogVol00 / ext3 defaults 1 1
This laptop has a single partition for the system (/); /home is a directory.
Fedora core uses LVM by default. It has a graphical LVM manager to add disks to an LVM volume. On SuSE, you can do the same thing using their partitioner program. You can also do it from the console. The first step would be installing the LVM package. Read the README and any howto's installed with the package. The LVM package installs several programs. For example, suppose you had a 10GB disk. You want to replace it with an 80GB disk. You could migrate the contents from the 10GB volume member, remove it from the volume, replace it with the 80GB disk, and add that one to the volume.
I'm not certain whether you can add the old /home partition nondestructively. In my first post I suggested creating an LVM volume, and mounting it as /home-new. Then copy the contents over from /home to /home-new. Now you can edit /etc/fstab and mount the LVM volume (it using the new disk(s)) as /home. You can use the old space from the old /home partition and add it to the volume. So now the LVM volume consists of the new disks plus the partition you were using previously for /home.