Lucy, I'm using PPT2003. Thank you for the tips and the offer of additional
assistance, although (see below) I think I'm all set for now. Echo- Shyam's
tool added the duplicate shapes at the end of the animation- what a great
tool! I was unable to figure out the rest of his tool and if/how to use it
to align the endpoints of the motion paths. I looked for any sort of help
file but didn't see one. The second part of his tool asks for the user to
select multiple motion paths, but the drop-down box would only let me select
one, even when I held down <ctrl> so I couldn't really play around to figure
out what it does.

I added a one-column table to the master slide (so I won't fight with which
objects are selected while I'm working on this) and added an additional
vertical line through the middle of the column; I'm trying to align my
motion endpoints (tiny white circles) so that they are centered on that
vertical line and are placed about halfway in each cell. The two challenges
this morning were (a) not all of my objects (ovals) are exactly the same
size, because I had to enlarge a few to fit the text. I went through each
one to get the max height and width, then selected all and set them to that
size at the same time. I ended up having to move a bunch around on the
slide, but it would have been worse trying to fix this later in the process;
and (b) even with the grid on the smallest possible size (.039 inches) I
have trouble getting the endpoint to actually sit on my homemade guideline.
I ended up turning off the 'snap to gridline' and 'snap to objects', then on
the master (creatively interpreting Lucy's suggestion) a diagonal line
within each table cell so the intersection of that and the vertical gave me
exact center. Once I had turned off the 'snap to' I was able to place the
endpoints where I needed them.

I think between Lucy's advice for positioning, and Shyam's tool for creating
endpoint copies per Echo's recommendation, I'm good to go.

Many thanks to both of you!
Keith