Excel Tip #001 – Create New Line In Excel Cells – Microsoft Excel 2010 2007 2003
https://www.youtube.com/watch?v=06ilhpdskTc
To start a new line of text or add spacing between lines or paragraphs of text in a worksheet cell, press Alt+Enter to insert a line break. Double-click the cell in which you want to insert a line break (or select the cell and then press F2).