Which command is used to combine multiple sheet bodies into a new single sheet body?

The command that is used to combine multiple sheet bodies into a new single sheet body is "Sew." This command is particularly useful when working with sheet bodies in design, as it allows the user to merge several sheets into one coherent body, effectively simplifying the geometry and enabling better manipulation of the design as a whole.

"Sew" is designed to work specifically with sheet bodies, and it generates a new body that reflects the combined edges and faces of the selected sheets. This is essential in scenarios where a designer needs to create complex forms from multiple separate sheets or when they aim to improve the efficiency of the modeling process by reducing the number of individual bodies in a design.

The other options refer to commands that serve different purposes within CAD modeling. For instance, "Merge" and "Unite" may relate to solid bodies but do not specifically address the combination of sheet bodies, which might lead to confusion if applied out of context. "Combine" is more general and could refer to various operations not limited to sheet bodies, making it less precise for this specific task. Therefore, the "Sew" command is the most accurate choice for combining multiple sheet bodies into a single entity.