Hello Planning Engineers,
Sure you can use Excel to update your schedule Actual %, Actual Start, and Actual Finish. I am using this method because it is much more easy. I have created a complete tutorial for doing this starting with the Excel template you need to use to get your update until you import the update from Excel to P6. Please check this Article: https://planningengineer.net/import-progress-updates-with-actual-dates-from-excel-to-primavera-p6/
Best Regards,
Hany