Can I install windows on another hard drive?

So, I just purchased a 1TB hard drive and was wondering if I could install windows on to the new hard drive and leave my mac hard drive (128GB) just OS X. Is there any way to do this through Boot Camp?

Installing Windows on an external drive is not supported.
Neither of MacBook Air (13-inch, Mid 2013) - Technical Specifications or MacBook Air (11-inch, Mid 2013) - Technical Specifications have a built-in Optical drive, so you will need to use a USB2 disk, Bootcamp Assistant and a Windows ISO to create a USB installer and install it on the internal disk.
Please start at How to install Windows using Boot Camp - Apple Support.

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