Linking workbook to powerpoint pictures

[Kate]

Hi,

I have a presentation where I need to present a summary of
things from a spreadsheet. What I would like to do is
have pictures on the slides that link to the information
in the "master file" workbook on the same power point.

Any idea how to do this? I would like to reference
through a formula but I can't figure out what power point
named the master file (within the presentation).

Any help would be GREATLY appreciated. Thank you!!!

Kate