Google Spreadsheets: How To Add Multiple Lines in the Same Cell
Contributed by Rob Rogers 
Tagged: Google Google Spreadsheets allows you to have multiple lines in the same cell, this is useful for items such as addresses.
Type in your data and use Alt+Enter (Option+Enter if you are using a Mac) to add a new line in the same cell.
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Lou said on January 30, 2010
As of 1/29/2010, you should use ctrl-enter to put multi lines in a cell