I\'d like to be able to copy a colum (well 3) from a spreadsheet to another spreadsheet (google docs spreadsheets). I\'d also like there to be some sort of trigger that looks fo
Since you are copying the data into the other spreadsheet you have to specify the other spreadsheet's range object. So, instead of your last line:
var target_range = target_sheet.getRange("A1:B2"); source_range.copyTo(target_range);
var target_range = target_sheet.getRange("A1:B2");
source_range.copyTo(target_range);