Charlotte-based Monaghan Group will be rebranded and begin a national expansion, parent company CliftonLarsonAllen announced today. CLA, one of the largest professional services firms in the U.S., purchased Monaghan Group in 2013 and it has operated as a division of its new owner since then. Now CLA plans to take Monaghan Group's business model to other CLA offices nationwide and rebrand Monaghan Group as CLA Custom Accounting Solutions Team (CAST). CLA CAST will offer the same services Monaghan…