(first of all, normally it is better to put solids in the body and surfaces in geom. sets. In lots of industry hybrid design is forbidden)
thank u very much..
i'll try it now..
could this be a solution?
maybe it's late but i want to help u if you didn't that yet .
go step by step with that pictures in below
always in your designs pay attention to the designTree.
after these pic u can use" pocket "or "slot" to create the groove.
have good work.