Nadia Cavner Group of Springfield, Missouri, has sold its business to Overland Park-based Lawing Financial. The selling price was not disclosed. Nadia manages about $300 million in client assets. Lawing is an investment and financial planning firm that manages more than $3 billion in customer assets. The company employs about 90 investment advisors and 35 other staff members. Lawing's goal is to open new offices each year in a new city over the next few years.