Hi all, I am trying to model slots / grooves onto the surface of a modelled part. Really the effect id like is to cut extrude half a circle down along the curve with an equal depth.

Ive attached the part and hopefully itll make more sence?! Its just totally flumaxed me now - dono if its just because its a Friday afternoon and all I want to do it be outside! HAHA!!

Thanks for your help,

Andy