1. Type the opening. Inches (120) or feet-inches (10'-0"). The drawing and PDF always print in inches. The opening is the hole in the wall — it does not change when you add bucks or mullions.
2. Place a unit by clicking the hatched pocket (or Add unit). Split vertical for two side-by-side, split horizontal for stacked. Split into 3 across or 3 stacked for three equal units. Type exact W and H on each unit — those sizes stick; the opening updates to fit. Drag a mullion only if you want to change the mix.
3. Pick the type on the selected unit: Fixed, Single Hung, Horizontal Roller, Casement, Swing Door, Sliding Glass Door.
5. Layers. Use the Layers panel (Opening, Bucks, Units, Unit IDs, Dimensions, Mullions, Mullion labels) to show or hide each CAD layer on the drawing and the PDF. Off layers do not print.