Will using a 10.6 disc to partition my OS 10.4 iMac erase my files?

I want to partition my iMac running OS 10.4.  From my other Mac, I have an OS 10.6 disc to use for the Install disc. 
I checked with Mac help, and it reads,
"Partitioning a disk erases all the files on the disk. If you have any files on the disk you want to save, be sure to make a copy of them on another disk before you partition the disk."
Will the partition I don't select for 10.6 installation maintain 10.4 with all my stored files?

Here is what I'm looking at in Help followed by clarification of my question.
To partition your startup disk:
Insert the Mac OS X Install disc and restart the computer.
When you hear the startup tone, hold down the C key until you see the progress indicator (looks like a spinning gear).
When the Installer appears, choose Utilities > Disk Utility.
Select your disk from the list, and click Partition.
Select how you want to partition the disk and any options you want, then click the Partition button at the bottom of the window.
Quit Disk Utility.
When the Installer opens again, you can install Mac OS X on one of the partitions.
If you want to use another disk as the start-up disk, choose Utilities > Startup Disk and choose it.
I have my files in 10.4 backed up on cd's.  I'm asking the question so I know how much time will be involved to get my Mac back in order after partitioning.
To put the question another way,
If I use the 10.6 disc for Install (step 7), will I then have to install 10.4 again on the other partition?

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