How do I undo matter on Catia?

I just drew a cable car cabin, I want the inside of this cabin in the photo to be empty how can I do it? I tried with the Pocket function it doesn't work and also the case function ... Thank you


capture1.png

Hello

At first glance (it would be better with a screenshot of the graph).

I would pass the shell, or the pocket before making the 3 side openings (Right click in the graph "define the work object") this allows you to perform new operations where you want the order of construction of the model (the graph).

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