Create the basic "step"...

1. Turn on Gridsnap if necessary. This helps ensure that the RH face aligns exactly wiith the Y-axis. Also, turn on "Select through" (this will be useful later).

2. Click the Draw Box Tool.

3. Draw the box. use the bounding-box handles to fine-tune your box (easiest done using the Front/Side/Top views). Make sure that one side touches the Y axis.

4. Also make sure (using the side view) that the box is exactly centred on the Y-axis (you will need to make sure your side-view has an even number of "units").

• All the playing around with the Y-axis alignment isn't strictly necessary, but makes thing a lot simpler later on..
• Re. the grid. There are actually 2 grids there, the one with dark lines and the smaller-scale one with lighter lines. The smaller one is the snap grid.
    Don't worry if your setup isn't the same as mine (I can't remember off-hand what the default is), but it shouldn't really matter.
    You can, if you wish, change the grid sizes via the menu File->setting, in the General tab. The top two boxes (Grid Major and Grid Minor) control these two grids. Mine are currently set at 1.0 and 0.1 respectively.

next.. making the step wedge-shaped.