graphs in Excel

i have two graphs in Excel, i want to export them to power point , the way
that the first slide will include one graph and its datum, and in a click of
a button , the datum of the second graph will slide and appear on the same
graph (the first one) instead of making two slides with two graphs, in
another words my problem is to use only the data curve of the second graph as
an object that i can paste or to animate so it would appear on the first
graph and his data curve.
thank you
Michael from Israel