According to the Epic Level Handbook, you just need to add levels. The only change is that BAB and Saves are adjusted. Reduce the BAB and saves by whatever the post-20 levels give you, then add +1 to attack rolls for each odd level and +1 to saves for each even level
The only time it gets more complicated is if you have more levels in a class than it normally has (like 21 levels in Fighter, etc.).
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