Which Draw command is particularly useful for creating structural grids from a CAD drawing in Revit?

The Pick Lines command is particularly useful for creating structural grids from a CAD drawing in Revit because it allows users to reference existing lines in the imported CAD file and convert them directly into Revit elements. This command recognizes the edges of lines within the CAD drawing, enabling a quick and efficient way to generate structural grids that align precisely with the existing geometry.

Using Pick Lines streamlines the process by eliminating the need to manually redraw the grid lines, ensuring accuracy and saving time, particularly when dealing with complex layouts that are common in architectural and structural designs. It also encourages a more collaborative workflow as it directly integrates CAD data into the Revit environment, facilitating smoother interoperability between the two software platforms.

The other options, while useful in specific scenarios, do not provide the same efficiency or alignment capabilities with imported CAD drawings as Pick Lines does. Therefore, choosing Pick Lines is the most effective method for this task.