I don't understand the question.
There are several ways of starting an installation of win98/ME.
One is to boot from a startup boot floppy which boots into dos (A: prompt) and loads CD driver so you can access CD drive. In dos you can use tools like fdisk (create & delete partitions) and format (format partitions) to prepare the hard drive for the install. Once hard drive is partitioned and formatted you can start the install from the cd by typing x:\setup (where x: is the CD drive letter - it will tell you what this is during the floppy boot process).
Another is to boot from the install CD itself. If the hard drive is not partitioned, this process will ask you if you want to partition it.
So if you're using a startup floppy, and you want a clean install (ie, all previous data on the disk removed before starting), you need to run these commands from the A: prompt.
fdisk - this will display a menu - choose display existing partitions. If there is just one, exit disk and at the prompt type format c: /q (this will do a quick format, which is sufficient and much quicker than a full one). When its complete, type x:\setup (as per aboc#ve) to start the install.
If there are more than one partition, use the delete partitions options to remove them.
If there are (now) zero partitions, use the create partition option to create one - use the whole disk. After its complete it will tell you to reboot. Do so (with boot floppy again) - then when its back at a: prompt type format c: (you can't use quick option on new partition), then x:\setup as before.
Note: Always choose to start the machine with CD support.