Which command allows you to duplicate existing geometry in a part?

Choosing the command for duplicating existing geometry in a part, the correct answer is Duplicate Geometry. This command is specifically designed to create an exact copy of selected geometry within the same part or assembly. It efficiently handles the replication process without altering the original geometry, allowing for modifications or manipulations on the duplicated instance separately.

This command is particularly useful when you need to use similar shapes or elements in different locations or orientations within your design, thereby enhancing efficiency and workflow.

The other commands serve different purposes. Extract Geometry is typically utilized for pulling in geometry from another part or to reference existing geometry for creating new features, rather than duplicating it. Copy Feature is more focused on duplicating features (like extrudes and revolves), which may not directly apply to plain geometry. Interpart Link is designed to create a linking reference to geometry in another part, which also does not duplicate the geometry itself.