Excel database for Visio Org chart

I am trying to develop an Excel spreadsheet to export to Visio to manage our company's organization chart. I've gone through several different online training programs and understand the basics, however, I would like to put several employees into one box (ie: metal trades people all in one box under "metals" title) and am having difficulty figuring out how to do this. Is it possible or just a pipe dream? Both my Excel and Visio programs are 2013.