ADDENDA Solutions Business Plans ADDENDA Solutions is a “true blue” full-service, one-stop business management, administration and workforce management support services firm. We are dedicated to solving common, everyday business problems that stand in the way of your company achieving its goals. We write your business plan, coach and counsel you. We look for ways to improve your customer service, boost your sales, strengthen your employee relations, operate more efficiently, cut your expenses and improve your bottom line. We help you solve problems, give you advice and direction when you are uncertain about what do.