Selection Toggle Trick

When you are selecting objects in Revit if you hold the ‘Ctrl’ key down on your keyboard while picking it will add elements to your selection set. (There will be a little plus sign ‘+’ beside your cursor)

If you hold the ‘Shift’ key down on your keyboard then it will subtract elements from your selection set. (There will be a little minus sign ‘-’ beside your cursor)

Now here is the little trick…

If you hold both the ‘Ctrl’ and the ‘Shift’ Keys down while selecting it will toggle between adding and subtracting elements. (There will be a little plus/minus sign ‘+/-’ beside your cursor)

So instead of having to switch between the ‘Ctrl’ and ‘Shift’ key, just get used to holding both keys down when you are selecting elements.