What command is used to duplicate a part and then modify it?

The command that is used to duplicate a part and then modify it is the "Move and copy" command. This command allows the user to create a replicated instance of a part while providing an option to reposition that duplicate. After duplicating, it is possible to modify the duplicated part independently from the original.

"Move and copy" is particularly useful when there is a need to maintain the same design elements but make variations or changes in the new instance, which is a common requirement in engineering and design workflows. The capability to duplicate and modify directly supports iterative design processes, enabling designers to explore new variations efficiently without starting from scratch.

While other commands could perform similar functions, they do not specifically provide the functionality to both duplicate and reposition a part in a straightforward way, making "Move and copy" the most appropriate choice for this task.