You can link excel data or chart into PowerPoint presentation. This link can will update in PowerPoint one you update in Excel.
The process is instead of pasting data into PowerPoint paste link into your slides.
- Open your excel sheet. Copy data or Chart you want to link
- Now open you PowerPoint, select the slide where you want to insert chart.
- In Home tab go to Paste -> Paste Special
- Now Paste Data as Paste Link.
This Link will update by itself at time of opening of PowerPoint Presentation.