A word to those who have limited download limits, don’t even think about downloading the DVD iso for SLES10, its 8GB’s whereas the 5 CDs are approx 3.5GB’s in total. Why fill that DVD to the brim with free space, thats daft!
On another note, personally I hate waiting around when doing an install to shove in cd 1, cd 2, cd n, etc. whenever they are required. Also some of the cds are more than 700MB so if like me you have no bigger capacity CD-Rs lying around the method below may be the only way for you to install. Also, its really fast compared with cd or dvd installs.

Step 1.
Download your iso’s
Step 2.
put them somewhere on your hard disk
Step 3
mount your iso’s and copy the contents of each cd into directories
e.g. DirToInstallFrom/CD1, DirToInstallFrom/CD2 etc.

Step 4
copy the linux and initrd images from CD1/boot/loader into your boot partition making sure to rename them to something sensible ( otherwise you will clobber your existing install )

cp /DirToInstallFrom/CD1/boot/loader/initrd initrd-sles10
cp /DirToInstallFrom/CD1/boot/loader/linux linux-sles10

Step 5
add a new entry into /boot/grub/menu.lst or /boot/grub/grub.conf like

title Install SLES10
kernel (hd0,6)/boot/linux-sles10 root=/dev/sda7 resume=/dev/sda6 elevator=as showopts
initrd (hd0,6)/boot/initrd-sles10

Step 6
reboot machine, select “Install SLES10″ from the grub menu, when you get prompted to “make sure that you have cd1 in the drive”, click the back button, this to bring you into the manual installer, then
select language
select keyboard map
select “start installation or system”
select “start installation or update”
select “hard disk” or “nfs”
for install from hard disk, select the partition the directory “DirToInstallFrom” is located on and give the full path to CD1

for install from nfs the instructions are the same except obviously the dirs “CD1..CD5″ will be located on another machine somewhere, select the nfs install option, give the machine name or ip address and again give the full path to CD1 ( make sure u export this dir from /etc/exports and have the nfs service running on the machine serving the install media )

Note: I never tried the ftp option but presume its the same sequence

thats it, happy installing