Basically you install ME first and then install Win 2000. Here is the general process as I see it.
1. Install Windows ME.
2. While at the ME desktop, put in the Windows 2000 CD-ROM. It should auto-run and state that the CD contains a newer version of Windows, and ask if you want to install it. You'll have the option to upgrade your current version of Windows, or install a new copy. Be sure to pick "Install a new copy" or it will try to install over your version of Windows ME.
3. Windows 2000 will start to install, then will require a reboot.
4. Next, Windows 2000 will display your drives and partitions. It will ask which partition you want Windows 2000 installed upon. Select any of the partitions. If you only have one partition it will go thorough the process of creating a new partition. You can even select the one that Windows ME is on, but don?t do it. Even though Windows 2000 will install to /winnt, not to /windows, the OS? work more reliably if they are on different partitions. When prompted whether you want that partition reformatted answer yes but make sure you are not using the partition that ME is on. If you did decide to put 2000 onto the same partition as ME then be sure to select that you want to keep the existing file system intact. Also, it you have Windows 2000 reformat any partition to NTFS you will not be able to see or access folders or files on that partition when you run ME.
5. Installation will continue, with numerous reboots. Windows 2000 will automatically set up a dual-boot menu.
When the install is complete you should see a menu similar to this:
Microsoft Windows 2000 Professional
Microsoft Windows
A countdown timer will start, and automatically boot into the first option in 30 seconds unless a key is pressed. Select the option you want and press enter. "Microsoft Windows" will boot your previously installed Windows ME.