Click "Customize-Customize Floor" to select the floor and enter the customize floor interface. Click on the "Line" drawing tool above to draw the floor platform shape, and you can draw by entering the dimensions. After the floor shape is drawn, select the "Rectangle" tool to draw the shape for steps. You can enter dimensions to draw, and you can press the "Tab" key to switch the dimension input during the drawing process. Once the drawing is complete, enter the "Extrusion" value for each section, then the floor and stairs are drawn.