Need help changing basic chart into a hierarchy chart/table in Excel 2010

Hey all,

First and foremost, apologies if this has been asked numerous times or if it's really simple and I'm just missing something. I spent the last 2 hours browsing Youtube but I can't exactly find what I want, and at this point I'd rather not spend any more time doing "nothing" because I want to have something to show my boss before I go for lunch.

Moving on...here's the situation and what I need:

I currently have a table with multiple columns. The columns are as follows:
CompanyName, PhoneNumber, FirstName, LastName, PositionTitle


I have about 200+ companies in my list, and multiple contacts at each company. Basically, I want to be able to expand/collapse the CompanyName category. When I expand it, I want to see who all the contacts are with their first and last names, and their position titles.

Eg:
CompanyName

FirstName, LastName, PositionTitle

FirstName, LastName, PositionTitle

FirstName, LastName, PositionTitle

FirstName, LastName, PositionTitle

CompanyName

FirstName, LastName, PositionTitle

FirstName, LastName, PositionTitle

CompanyName

FirstName, LastName, PositionTitle

FirstName, LastName, PositionTitle

FirstName, LastName, PositionTitle

A total for the number of contacts per company would be useful too, because I will then have to rank the companies into 3-5 categories, based on how many contacts are there.

Thank you very much in advance!

Cheers