Fill Text To Excell 2010

One of if not the most valuable functions of Excell is to enter into a Cell what could be several lines of text, and then close the Cell so that only the first line or first words are visible, for example an address.

Selecting and opening the Cell expands the Cell to reveal all of the contents.

This way, we are able to keep Cells which could all contain varying text lengths, all the same size.

Open the Cell to show all of the contents, close the Cell to show only the first line or words.

Simple, can anyone tell me how to do this please.

Thank You

Vegaone