Devices and methods are disclosed for framing openings for doors, windows, store fronts, air conditioning units and other purposes, in walls formed of cast-in-place concrete. The devices include a jamb member having attached first and second inner flanges with angled guide surfaces for guiding placement of a wall forming system in alignment and engagement therewith and for anchoring the jamb member following hardening of the poured concrete. A method includes use of the disclosed jamb member to frame an opening in a building wall.