In the Outline pane of Normal view,
click the slide after which you want to insert an outline.
Click the Insert menu, and then click Slides From Outline.
Locate and then select the file containing the outline you want to insert.
Click Insert.
Tip: to open an outline from another program in PowerPoint,
on the Standard toolbar,
click the Open button,
click the Files Of Type list arrow,
click All Outlines,
double-click the outline file you want to open.