Question on models and puzzles

I have a question on 2 topics one being models and the other being puzzels

Like to know if there is a program that for instance i want to make a model of some thing ( i looked on YouTube not see any thing ) say a model air plan. How does my laser know the size and shape of each piece of the air plan.

Second question Same as above but as a puzzle say i want to have a puzzle of a dog for instance. How would my laser engraver know which size and shape each piece is.

Is there a program for this. I am using Engravelab 9 laser engraver is a Bosslaser. Bosslaser.

Thanks in advance

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Question on models and puzzles