How to repartition drive to install Windows 7 32-bit on a 64-bit system

I just bought a gateway computer that has windows 7 home premium 64 bit on it. I need windows 7 professional 32 bit for my work and I understand that you can repartition your system to download the 32 bit on it. I already have the program both 64 bit and 32 bit professional.

Could someone help me with step by step instructions?

Thanks.

There is already an excellent write on a similar topic that may point you in the right direction

http://www.techspot.com/guides/143-dual-boot-windows7/

Thank you so much. It looks to be very similar to what I'm looking for. I will check it out. Do you know if the 32 bit will work on the 64 bit when partitioned? My grandson has a laptop that has all three installed on it - 32 bit, 64 bit and 86 bit. So, I am assuming so.

Thanks

there is no such thing as 86 bit