If your project requires embedded angles: Ram-Sanp is the answer!
Have your steel supplier drill 1/2" holes along the face of the angle that is facing the form. The spacing of the holes depend on the weight of the angle and the length of the piece.
Wrap a Ram-Snap around a secured bar and through the angle iron. Cut a slot in the form with a drywall saw and insert the Ram-Snap into the form. Push the eye of the Ram-Snap
through the slot and through the form. Use a board that has pre-drilled 1/2" holes in the same location as the holes in the angle iron. Slide the board over the Ram-Snaps and using the tool apply pressure against the board. When you can see a 3/4" gap between the tool and the board, insert the clip.
Repeat this procedure for the entire lenght of the board. Your angle is now secured!