Q9: Can I add or subtract the display of one geometrical part(s) or shape(s) from the current display?

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A: Yes, by using:

VIEW {GEOMETRY | SHAPE} +/- Part [Colour]

When displaying named parts the name may be prefixed with a "+" or "-" sign to indicate if the part is to be added to, or subtracted from, the current display (only parts that have been specifically added to the current display may be subtracted).