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Beginner alignment

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I have a somewhat newbie question.   See attached doc for my attempt to help explain.  I have to align this part to BCD.   -B- is a plane in 0,-1,0 (facing me).   -C- and -D- are counterbores of thru holes.   So I level -B- to Y- and set -B- as my Y origin.  I'm stuck after this.  I don't know how to rotate -C-.  Or even what my rotation should be.   I want the part facing the same direction I have it in (Y-) when I align it to BCD.   Can I create a line from -C- to -D- and rotate that about Y-?   Or is that "illegal" from a GD&T standpoint (meaning should only -C- be rotated and not a -C- / -D- line?)  If I can make a -C- / -D- line do I have to trig it out to get the angle to rotate.  I'm baffled to be honest.   I appreciate any help any one can offer.  Thanks so much.