How-to do a drafted solid ?

 From:  Alomphega
5206.1 
Hello,

How can I do a draft to obtain a drafted solid ?
(ie: slope the vertical walls, for instance to prepare a piece for injection molding)

Best Regards,

Guy Capra,
always working on few funny projects :
www.nauticaerium.com ; www.conceptarum.com and so on...