How can I partition an already in use external?

I have a 250gb external that I am using with Time Machine. Its still got plenty of space left, >80gb, and I'd like to see if I can partition it without losing what I already have. I know I can save files on the same disk without having to partition it but I would like to partition it anyways. I got bout 5gb of free space left on my internal HD and I wanna put my videos on the external. As long as I don't need any paid third party software I will do it. So, can disk utility do this? Or is there a way to do this?

You can probably do this. See item #6 in the Frequently Asked Questions post at the top of this forum.
Note that while you can have TM back this partition up along with your internal HD, it will send you a warning, reminding you that it really isn't a good idea. To have reasonably-secure data, you need (at least) two separate copies of everything important in two separate places. Don't trust both your originals and backups to the same physical hard drive -- when it fails (and it will, sooner or later), you risk losing both copies.
If your videos are fairly static, consider archiving them to DVDs.
And/or, get a separate external HD for them, and let TM back up both your internal HD and the new external.

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