Outlining

I created a multilevel list in a document a long time ago in Word 2003, but at that time I didn't know about the Outlining Feature (i.e. assigning true outline "Levels" to the list so that you can see them in the Outline view as "Level 1, Level 2, Level 3, etc.). Now when I open up this document in Word 2007 the outline still looks great in normal view, however when I view the document in "Outlining" view, the levels of my list don't show up in the "Outlining" view (i.e. everything is categorized as "Text Body").

How can I quickly and easily change this 150 page very detailed mutlilevel outline so that the levels of the outline show up in the "Outline" mode without having click on each individual line and manually change it over. That would take me 2 fully days of work to convert it that way one by one. There's got to be a quicker way.