It is not possible to merge the progress of two or more games into one.
Troubleshooting steps for error "Game Initialization Failed" when launching a game
This article explains the process of speaking to a Game Master (GM).
Use these steps to repair file permission settings for the game folder and all enclosed files/folders.
Information on bad Diablo III console game disc.
Trying to load the game returns error "Direct3D failed to initialize"
Troubleshooting steps for latency or connection issues when playing Blizzard games.
Information on Diablo III Account Rollbacks after your account is hacked.
Information on restorations for Diablo III.