The following steps is for "Partition Magic"

1. partition a primary as active and format (say it parition A)
2. install an OS in partition A (now you have an original system)
3. install PartitionMagic7 (with Boot magic) in partition A.
(donot forget make rescue disks)
4. using PartitionMagic creat other primary partition
(hiden partition)-->B

***** be careful following the steps******

5. using PartitionMagic "Rescue disks" to boot your system.
6. hide partition A, unhide partition B and set active.
7. reboot your system..... you will see nothing, and freez..
(right, you are booting in partition B).
8. restart by OS installation disk, and install OS in partition B
(you cannot see partition A which is "hiden partition")
9. now, you have OS B...., but rebooting always in to the B.... donot worry!!
10. rebooting by PartitionMagic rescue disk.
11. set "hide partition B", also unhide partition A and set active.
12. reboot your system... now, should in the system A.
13. enable boot magic, and add other system B in the program.
14. reboot the system, now, you can see the
" BOOT MAGIC SYSTEM SELECTION MENU ", A AND B

GOOD LUCK....