You should be able to do this with Disk Utility.
I would like to make a suggestion:
You might consider partitioning the drive into _three_ pieces.
Use one for your T.M. backup.
Use another for NTFS.
Partition the 3rd P to Mac OS extended, and use CarbonCopyCloner or SuperDuper to create a bootable backup on it. If you do this, you will have an instantly bootable copy of your OS, apps, and accounts "close-at-hand". No need to do a T.M. restore in an emergency, just boot from your cloned backup and you'll be up-and-running again within two minutes. If you ever get into a "can't boot from internal drive" situation, just switch-boot to get back up, and then you can attempt a repair from your cloned backup.
If you do this, I also suggest you make the CCC backup partition the FIRST partition on the backup drive. T.M. can be the second, NTFS the third.