HOW TO DESIGN THIS FORM?

Draw a sketch on the center plane of the image, then extrude sketch using offset from surface and select the outer surface, set the distance you require the image to protude. If you modeled the cup using revolve you will have to do a revolve cut to clear the inside of the cup afterwards or create the cup with a solid center to start with then revolve cut the inside afterwards.

Dear John,
First of all, i wanna thank you for your answer!
It works!!!! I dont understand why i couldn't figure it out ,maybe because I'm french...
THANKS!!!!

The only solution who works in SW2007:

john fall says:

Draw a sketch on the center plane of the image, then extrude sketch using offset from surface and select the outer surface, set the distance you require the image to protude. If you modeled the cup using revolve you will have to do a revolve cut to clear the inside of the cup afterwards or create the cup with a solid center to start with then revolve cut the inside afterwards.
Thanks to both of you, really.