There are two questions:
1) How to change values in a gauge (generated by BeGraphic)?
2) How to export and re-export them to PowerPoint?
Answers1) To update your gauges inside Excel, you have to:
- put new values and colors (e.g.: with "conditional formatting")
- press the "Launch animation" button (to update your gauges)
2) To export your gauges (without loosing details or graphical layers) to PowerPoint, you have to:
- export on one different slide another gauge (= the range of cells that contains the gauge)
- If you want to update gauges, you have to re-do the previous step