Ahh makes much more sense now...
Set up a loop on x to
Update ("B.F" + x)
where A.id = B.id and A.stepvalue = x
x goes from 1 to max(stepvalue)
Set up a loop on x to
Update ("B.F" + x)
where A.id = B.id and A.stepvalue = x
x goes from 1 to max(stepvalue)

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