A Greenbelt-based information technology company is combining three of its subsidiaries to form one larger company so it can better compete for contracts from both business and government clients. Presidio Networked Solutions announced its formation today. The company is made up of the former service providers Presidio Corporation, Networked Information Systems Inc. and Solarcom Holdings Inc., CEO Joel Schleicher said Friday. Presidio Networked Solutions was formed to better compete with larger IT companies and to capitalize on all the subsidiaries’ partnerships, Schleicher said.