Can I split an external hard?

I have an external hard that has 2 partitions (time machine and Storage) both are Mac OS extended. Can I add a third one.  I need to add a very small one (around 10 MB) that I can use to transfer DVD contents from my PC (that has a DVD drive) to my Mac that doesn't have a drive. Using Remote Disk wasn't optimal for that purpose.

Yes. Choose Utilities from the Finder's Go menu and use the Disk Utility to do so.
If you're going to use File Sharing over a network, you don't need to create a third partition. Just use the existing Storage one.
(121488)

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