The last step is applying custom credits to each source/channel. This is one of my favorite part of analytics. If one channel is more important to you, you can assign more credit to it than other channels. If one is less important or not important at all, you can give less credits to them. If you feel that your display advertising retargeting campaign is more important than the other source because it brought the customer back to the website, you can assign it more credits. For e.g. I have given 1.5 times more credits to Display campaign than other campaigns. This was just for example, you have to do a lot of experimenting to arrive at this number.