fixing repeat export error in imovie or any other i-things

One of the most annoying thing of built in i-things (iphoto, imovie etc) that once you want to do more than what is there, it is very hard. However, what makes it worse is, when you export it and you got it wrong, you just keep getting it wrong.

Yesterday while exporting a video from imovie found the solution - duplicate the project and change the settings in that duplicated project. If you do that, you can export again. Else - oh well!!