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Every dimension has a shown or implied tolerance, the dimensions shown as HOLD are the dimensions that are not to be affected by the stack up of tolerances of the holes or features around them.
If the working drawings are what is used to manufacture the object then there should be no difference. There will be more detail given in the working drawing but they would be engineering tolerances.
You take a ruler or tape measure and measure the dimensions you need.
You need to measure the dimensions.
If you multiply two measurements, you get only two dimensions - an area. For a volume, you need three dimensions.