True position, calculating theoretical distances

#1
I'm quite new to GD&T, so really need all the help that i can get.
Shortly, I work in a company in the quality control sector with a 3D CNC measuring machine, and relatively recent started measuring according to the GD&T requirements. Also, machine that i work with does not calculate true position so i do it manually. Many useful tips i found on this site by reading experiences and examples, but now i am really confused and hope someone can help me with this one because before me is a request that completely do not understand.
According to the requirement below for position 0.4 B needs to be measured for example distance from B to Pin 1 (21.9) , but how should i calculate true position A/B></D ?
All the help that i got was info that it needs to be calculated the missing theoretical distances to the Basis D, by taking the distances from B to D (39.3) and calculating it with the other theoretical distances. But i still don't understand which other distances.. How and which distances need to calculate ??

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