Select a Two Column Layout to divide the outside container into two sections. The width of each section can be customized.
Begin by clicking on the 2-Col Layout and dragging it to the desired location.
Adjust the width of the divisions by clicking on the dividing bar (turning it blue) then dragging it to the desired width. You can adjust the width at anytime.
Drop additional modules, widgets, or layouts in each drop zone of your two column layout.
Here is an example of a Text Editor with an image inside a two column layout with menus on the left.
