When can new floor plans be generated in Revit?

New floor plans can be generated in Revit whenever a new level is created. Each level in a Revit model corresponds to a vertical datum where different elements, such as floor plans, can be defined and managed. When a new level is established, it provides a basis for the creation of a corresponding floor plan. This means that as you design your building and add additional stories or levels, Revit allows for easy generation of new floor plans to represent those levels, facilitating organization and clarity in the project workflow.

Creating a floor plan based on levels supports the management of views and contextually organizes various components of the model. The other options are limited in that they either restrict the generation of floor plans to specific moments in the workflow (like only at the initial setup or after complete modeling) or imply manual processes that would not leverage the automated capabilities of Revit. Thus, the creation of new levels and the corresponding floor plans is an essential part of the design process in Revit, making that choice the correct one in this context.