How to load STL files as an assembly?

Alan 2019-9-20 1379

I am trying to print a platform jack lift. The print has several parts that need to be printed at the same time already assembled together. How do I load the various STL files into ChiTuBox so they are in the correct postion to print them all at once assembled? I use Fusion 360 to create the STL files. I am trying to print something similar to this object:

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