This is a response of Bob Buckland, I hope this is what you are looking for:
In Word it's a bit of trying to figure out where 'Escher 2', the new graphics
engine/features are supported and where they've kept
alive the older engine features
There are a couple of variations, some dependent on where the clipart in the
organizer came from
See if this works.
1. In Word 2007 select Insert=>Clipart
2. Search for 'pie' (all collections all media types)
3. Select a WMF file and insert it in the drawing
(I usedj0233497.wmf among others)
4. Right click the inserted graphic and set Text Wrapping to Inline with text
(you can change it later, but this should allow step 5
to be active).
5. Right click on the inserted graphic and choose Edit Picture, this basically
puts a drawing canvas around the graphic (resizing of
the graphic before this step or before ungrouping can make things a bit easier
<g>.
6. Right click again and select grouping. If ungroup is greyed out but
'regroup' is live then the 'pieces' may have already
separated in Step 4, although the handles on the individual pieces may not be
visible until you click on a segment. If you select a
segment and get the grey circled corner handles on the segment right click and
ungroup should blow things apart into the rest of the
parts, as in prior versions
If you use Insert=>Clipart and add the graphic there is, on the ribbon, a
grouping icon on the 'Page Layout Tab' for grouping
multiple objects (so it's greyed out) and when you insert the clipart the
Ribbon's Picture Tools=>Format tab the 'grouping' choice
in 'Arrange' will be greyed out until you right click=>Edit on the WMF and then
the Ribbon changes from 'Picture tools' to 'Drawing
tools' and you can use the Shape Styles, Shadow effects, Fill, etc from Drawing
Tools=>Format on individual segments.
You can also use Insert=>Shape=>New Drawing Canvas first and then insert the WMF
file in the canvas from the ClipArt pane.
In PowerPoint, since each slide is in effect a drawing canvas, if you right
click after inserting and right click=>Grouping=>Ungroup
the 'convert to drawing object' step will let you ungroup items.