Changing the Source of a Link

[jsv]

I have a ppt with approximately 40 graphs linked to mutiple sheets in a
single Excel workbook. I need to duplicate one of the slides, which has six
graphs on it, but change the source sheet. (Again, all sheets are in the same
workbook.) I need the six graphs to be arranged exactly the same on the
duplicate slide. (Essentially, it will look like the same slide, but will
have different data.) It would be easier to change the graphs' source than
delete the existing graphs and recreate the slide (because of all the graph
nudging required!).

How can I change the source of a graph when the new source is in the same
file?

Thanks!