Adding new disk on SuSE 7.1

Hi, It took me few times to install the SuSE 7.1 Pro. It's very fine. Anyway, as I always switches between my 7.1 disk and another one installed with *Win*, I'm trying to boot on the first one with lilo and add the dos OS into the boot loader. Does it make sense ? Could it be loaded, as the dos will be installed into another disk ? Anyway I didn't find into Yast or Yast2 how to add the dos partition, into the fstab, and into lilo. Any help ? Thanks 4 All Bests Pascal MiQUET