How to get a big assembly model into 1 solid body part

Hello, I'm working on a 3D layout with big machines that have around 3000 to 4000 parts, it is very heavy to open and save the assembly. So I would like to get one simple block to put it in a 3D layout.
I try to save as a Part, but the part is made with surfaces, that are very heavy to manage too and to work with.
Is it a manner to Export and Import the assembly to get only one part made of solid bodies?

Thank you!

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