This is the first tab option in the "Edit Space" window.
First select the space you would like to divide and go down to the space level using the level arrows as shown previously.
Next select edit from the drop down menu
The edit space dialogue box (image below) will appear along with the cutting plane in the modelling window
You can select the orientation of the plane
Click to action the position change
You can either manually type in the co-ordinates of the cutting plane or you can click on the tool at the top of the box (get locator co-ordinates from space vertex tool) then click and drag (holding the left mouse button) the three corner points of the cutting plane in the model space to position it as shown in the diagram on the next page
Click the generate cutting plane button and a yellow indicator will appear giving you a preview of the cut.
Finally you select whether or not you would like to retain the partitions and click the divide space button.
