ississauga said:

I need a router bit to shape the top part only, the bottom can be made
with a bit I already own.
..

Look here and find the profile you want:

http://www.whitesiderouterbits.com/c...atalogHome.asp

You may have to use a raised panel bit.
If they don't stock a bit for this, they can make one - for a fee.

That's gonna be a large bit, so you will want to reduce your router
speed or suffer the consequences. A high HP router will also be a
good thing - mounted in a table with featherboards - or a shaper.

I doubt you could safely do this with a handheld router configuration.

FWIW,

Greg G.