Text Box With A Scroll Bar

I am attempting to create a lookup spreadsheet. The big picture is this: I need a quick way to look up what paperwork i have and what i still need for each of my 200+ clients. I have created checkboxes and a document matrix where document names get color coded when a checkbox is checked next to clients name. Now i am attempting to add another feature where when the box is checked off i can see notes ive put in for that client. I picture it as a textbox with a scrollbar linked to a cell on a different sheet where the notes are stored. I cannot to get it to work, i am able to insert the textbox but the notes appear in a single Line, no matter how big the texbox is, which makes the scroll bar not function.