How do you create an assembly from existing parts in SolidWorks?

Creating an assembly in SolidWorks involves a series of steps that allow you to bring together multiple parts into a single, functioning model. The correct method is to go to File > New > Assembly and then use the "Insert Components" tool to add existing parts to your assembly.

This approach ensures that you have a dedicated assembly document where you can manage and manipulate the parts as a cohesive unit. The "Insert Components" tool provides a user-friendly interface for selecting parts from your existing files and positioning them in the assembly space. This allows for precise placement and alignment, taking advantage of constraints to define how the components interact and fit together.

The other approaches mentioned do not fit the correct assembly creation process. For instance, selecting "New Part" is geared toward creating a new part file rather than assembling existing components. The "Import" function typically refers to bringing external data into SolidWorks, which is not the standard method for creating assemblies from existing parts. Lastly, creating a sketch and extruding it is a method used for part creation, not for bringing individual parts together into an assembly. Thus, the outlined correct method provides the necessary framework to efficiently build and manage your assembly in SolidWorks.