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Iterative alignment

I have many yrs (25+) on cmms but new to PCDMIS. My question is about doing an iterative alignment using 3 tooling balls (TB's) on a gage.
Details are as follow.

The gage has a square base and is approx 500mm square. Car body coordinates are.....TB#1 (Lower left corner) X=331.98 , Y=566.99, Z=746.11 / TB#2 (Upper left corner) X=332.04, Y=808.24, Z=746.11 / TB#3 (Upper right corner) X=55.36, Y=808.24, Z=707.24 and the axis convention when completed as I look at the front of the gage (Same view described in TB location) is X+ right to left, Y+ front to back, Z+ is going down. I can measure the spheres, find the iterative alignment command in the construct an alignment menu and pick the appropriate TB's. I just don't know where to enter the coordinate of each TB for the correct offsets.
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