making a hard disk dual bootable

I HAD 17.2 GB HARD DISK WITH SEVEN PARTITIONS
OF 2.1 GB. I HAD ALREADY LOADED WIN-98 AND WANT TO INSTALL WIN-NT SERVER AND MAKE IT DUAL-BOOTABLE . BEFORE GIVING
A REPLY TAKE FOLLWING ASSUMPTIONS .

1. DISK HAS A IMPORTANT DATA SO IT CANNOT BE
FORMATTED.
2. AND ALL THE PROGRAMS IN WIN-98 SHOULD WORK PROPERLY.
3. NO NTFS PARTITIONS.

4. PARTITIONS SHOULD NOT EXCEED 2.1 GB