Modelling grooves on flat surface?!

Hey everyone,

This is my first post so i hope im in the right place! Basically im trying to box model a golf club iron, ive got the initial shape which was relatively easy to do. But im puzzled to how i can acheive the grooves on the club face. Basically im trying to create linear grooves on a flat surface (box), how is this possible?

Thanks for any help!