Asking for help creating a swept cut in a curved surface

Hello,

I'm hoping there are some toolmakers out there who have been able to create swept cuts on a curved surface. Looking for advice on creating a fluted tool (end mill) with a ballnose end. For reference I've attached a part with a square end. Trying to work with my reseller but ANY advice or suggestions from you folks would be appreciated. Using SolidWorks Pro 2011 SP3. Thank you.

SolidworksParts And Features