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There is, I can't believe no ones replied to this. just put the windows 10 DVD in and boot off it. It has to be a DVD though, the "bios emulator" that apple uses on these for windows wont boot off USB. Pretend like its not a mac, just install it like a regular old PC. Windows 10 should find most the drivers on its own. The only issue you'll have is the bootcamp support software for using start disk under windows, so youll have to switch OS's by holding option on boot. There is a way to get it to work which I can explain if you need, but most people are okay without it.
 
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