This tutorial demonstrates how to add an "Indent Text" menu item to a Google spreadsheet so you can indent/outdent text.
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When the "Indent Text" menu item is selected, any cells within a single column selection will be indented by 5 spaces.
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You can increase or decrease the number of spaces the text is indented by changing the line below so that the "5" is changed to a larger or smaller number (depending on your preference):
newValues.push(['=CONCAT(REPT( CHAR( 160 ), 5),"' + values[i][0] + '")']);