Container cutting windows and doors not working

I tried all the tips about cutting and intersecting the shape but non worked. also I checked what others asked about cutting windows into a container and tried that but also did not work.! the rectangular shapes is where I want the windows to be or in that shape. any help or other ways of doing it?
ShippingContainer|690x291

As there is nothing to see I’m going to guess that the container is made up a multiple groups or component forming the usual corrugation of the side walls and as such you can’t just cut through them in one go.
But without seeing the model or a link to the container itself it is hard to help.

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I posted a pnj about the container are you able to view it

No. You didn’t post a “pnj” and to actually see what’s going on, upload the SKP file.

What is a “pnj” anyway?

I meant PNG. I will try to upload the file

An image doesn’t provide enough information. The SKP file is needed.

ShippingContainer1.skp (247.2 KB)