Partitioning External HD in Windows Format

I have an existing External HD (Western Digital My Passport Essential 500GB), which has a Windows NT File System Format. I already saved approx 150gb files in it. I want to use this to back up my files in my Macbook Pro, but I'm hesitant to partition my External HD because it might erase my existing files.
How do I partition this without erasing any files?
Thanks.

The simplest answer (although it may cost some money) is get another drive and format it as Mac OS Extended, then copy your files from the NTFS drive to the Mac OS Extended drive.  After doing this, you can reuse the NTFS drive as you wish.
I believe you will need to use Windows itself or a Windows disk management app to repartition an NTFS drive.  Even then, NEVER assume your data is safe when you are modifying the partitions.  Back up before repartitioning any drive.

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