Modo 13.2v1 docs:

Duplicating Items

Often, it's the details that make objects compelling, and Modo's toolbox helps you focus on details when needed. By providing a variety of cloning and array tools, Modo makes it easy for you to produce multitudes of seemingly complex forms from basic geometry. With the Radial Sweep and Bridge tools you can extend and shape a surface very quickly. Extrusions provide a diverse set of options for generating and extending existing geometry, and therefore, you can take something simple and make it complex. For information on using a specific tool, click a link below to see that tool's topic.

Duplicate
	Radial Sweep	Creates geometry by revolving the selection around a central point.
	Curve Extrude	Extrudes a geometry selection along the length of a curve.
	Sketch Extrude	Extrudes selected polygons by drawing in the viewport.
	Bezier Extrude	Extrudes a geometry selection along the length of a Bezier curve.
	Pen Extrude	Extrudes a geometry selection along the length of a pen path where each knot creates a new segment.
	B-Spline Extrude	Extrudes a geometry selection along the B-Spline curve.
	Curve Clone	Clones geometry by clicking down control points for a curve.
	Open Curve Offset	Copies an existing curve(s) and positions it parallel to the existing curve at a specified offset value.
	Closed Curve Offset	Copies an existing curve(s), positions it at a specified offset value, and joins them together.
	Bezier Clone	Duplicates an object along a Bezier path a user-defined number of times.
	Pen Clone	Creates linear paths that have perfectly straight line segments between each user-defined point.
	Scatter Clone	Generates a random point cloud onto which Modo places clones of the original geometry.
	Clone	Creates duplicates of the currently selected geometry based on a specified linear offset.
	Array	Produces ordered duplicates of a mesh by cloning a source element into a grid-like pattern.
	Radial Array	Clones any selected geometry recursively into a circular or helical pattern.
	Mirror	Create a duplicate of the selected geometry in the active layer.
	Mesh Paint	Allows you to directly apply one mesh layer onto the surface of another.
	Bridge	Creates polygons to span the area between selected edges or polygons.
	Paste Tool	Add copies of any geometry currently in the Clipboard.
	Duplicate Commands	Duplicate, Duplicate Hierarchy, Duplicate Options, and Instance commands.
Procedural Duplicate
	Curve Fill	Fills closed, non-intersecting curves with quadrangles.
	Curve Rebuild	Uses a curve to build a new, similar curve but with a different amount of points.
	Pen Generator	Uses an existing polyline to provide a path for other tools to walk and evaluate.
	Content Preset	Offers a series of ready-made profiles, which are different 2D curve styles that can be used to generate new geometry.
	Sweep Effector	Draws geometry along a curve or line that is generated by tools such as the Pen Generator or Path Generator.
	Lace Geometry	Draws a tube along the path of a curve.
	Symmetrize	Procedural mesh operation that deletes half of the mesh and mirrors the opposite half in its place.