How to create two windows 8.1 partition & one OS X partition on my Macbook Pro?

I want to create the following partitions out of my 500 GB HDD :-

OS X Partition - 50 GB (for OS X installation & data)

Win 8.1 Partition - 100 GB (this is only for Windows OS & program installations)

Win 8.1 Partition - 350 GB (for data storage of WINDOWS ONLY)

I do not want to access any partition of one OS from another OS. (i.e I don't want to access any Windows partition from OS X or vice versa).

IS IT POSSIBLE that I make two partitions from Boot Camp & then when window's partition-window comes during the installation, I divide/create the boot camp partition into two parts again?

OR, install in the boot camp partition & boot to windows & later on divide/create a new partition from the Window partition, through some Window Partition manager software?

I'm new to Mac & need to purchase tomorrow. So please help ASAP!!

P.S. I'm mainly going to use windows but still want to have OS X as well, for no good reason. 😝 🙂

Thanks in advance! 🙂