You can generate tags at this step or choose “select from existing tags.” If you generate new tags, the code will be presented to you once you save and click on the Tags/Rules column. If you click on “select from existing tags” the field will populate with your saved conversion tracking definitions from your AdWords Conversion tracking settings. Keep in mind, which ever you choose, it cannot be changed later, this is a permanent setting. (You can edit the cookie duration, name, description and even which tags, but once a segment is created, it can’t be deleted. Mark the segment as “closed” and it will no longer appear as a choice for a marketing list, nor will it apply to your account, it stays in a paused state.)
To get started on a custom combination, you’ll need to have the remarketing lists you want to work with already set up. In this case, I have two set up- one for those that completed a transaction and one for those that added an item to their cart, proceeded to checkout to the sign in page and then left.
Don’t forget about negative audiences! Don’t forget! You’re excluding a type of group of user, not sites themselves.