Which command allows you to combine multiple parts into a single solid?

The Combine tool is utilized in Autodesk Inventor for the purpose of merging multiple solid bodies into a single solid. This command is particularly useful in both part and assembly environments, enabling designers to create complex shapes by adding, subtracting, or intersecting different solid bodies.

When combining solids, the Combine tool not only allows for adding multiple parts together but also provides options for creating new geometries from the interaction of these bodies. This capability is essential when working on intricate designs, as it helps streamline the modeling process by keeping the final product as one cohesive solid rather than separate components.

The Merge and Union commands may sound similar, but they do not serve the exact same function in this context. The Assembly command, on the other hand, is focused on bringing separate parts together to form a complete assembly, which doesn't result in a single solid but rather maintains individual entities within the assembly structure. Thus, the Combine tool is the definitive choice for consolidating multiple parts into a single solid in Autodesk Inventor.