Making a transparent Background object is very easy. Just choose No background in the New image dialog (File > New > check 'No Background'). But sometimes you need to make it transparent later on in a project. First convert the Background object to a simple object by clicking the 'Create object from Background' icon on the Background Object.
You can then decide if you would like to keep the background object or simply delete it.  If you keep it you can now easily create a new object and drag it below what was the old Background object.
Great if you didn't make it transparent from the start in the New Image Dialog for whatever reason. It only takes two clicks!

Tip provided by Stefan Lindblad, CorelDRAW Master, Illustrator, Graphic Designer & Artist.