Yeah, I'm in a management role and manage people with ADHD. Everyone is different, but what seems to work is getting into a routine. When every day follows a pattern, whatever planning tool you like can work since you can include it in the routine. For example, this could be your day:

1. Check schedule
2. Have breakfast
3. Go to work
4. Check schedule
5. Attend any morning meetings
6. Do work
7. Morning break
8. Check schedule
9. Do work
10. Have lunch
11. Check schedule
12. Do work
13. Afternoon break
14. Check schedule
15. Do work

And so on. Basically, check that schedule throughout the day and have fixed points during the day where you can reset if you get off track.