Empresa 3.0 is an integrated billing system in oscommerce that has two areas, one area to bill online and another to bill in stores with POS, all billing corrects the stock that helps customers in their purchases. Tutorial https://www.youtube.com/playlist?list=PLv6_VqQZKB8ZvoIgIoJ0NMUPNk6R_J86E downloads http://patrocinees.blogspot.com/2014/12/empresa-30-reglas-de-categorias.html