I would like to know this as well, please. I have made a custom image with Windows Updates and Drivers integrated, for example. Now, if I want to change something, say add an extra driver or Windows Update, should I load my previous Preset and add the extra driver/update or should I open my custom image, without a Preset (empty lists), and only add the new driver/update I want added? Sorry for the newbie questions, and thanks a lot for this great tool!