Hi,
This link says you link the excel object from Powerpoint. If you need it to change you need to go back to Excel and changes will immediately be seen in the ppt.
Once again, I'm not as good with versions and features on the Mac. Maybe one of the Mac guru's will jump in with an answer.
Looks like there is a way. See https://www.youtube.com/watch?v=ybbYVJSAdpc
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