KDH1 (Create Account Group) is a standard SAP transaction code available within R/3 SAP systems depending on your version and release level.
Below for your convenience is a few details about this tcode including any standard documentation available. In-order to use this transaction within your SAP system simply enter it into the command input box located in the top left hand corner and press enter. Here are a few additional command options available to use when doing this.
SAP Menu->Accounting->Controlling->Profit Center Accounting->Master Data->Account Group->Create
SAP Menu->Accounting->Enterprise Controlling->Profit Center Accounting->Master Data->Account Group->Create