After you have created element definitions for a door/window assembly style, you can assign those definitions to each of the door/window assembly element types: divisions, cell infills, frames, and mullions.
By default, one definition is assigned to all elements of a particular type. However, you can assign definitions to individual elements as well. For example, all cells in the grid are assigned the default infill. But you can create a new cell assignment, select a different infill, and then specify the cells to use that infill.
Assignment list