Couple of options:
You can make a basic cp and then rebatch it with extras. I don't do that, but there is a book in which that is the authors primary method. She gives a variety of recipes in the book that are supposed to be good for rebatching. Sorry, I can't remember the name of the book right now, but a search on Amazon and reading the reviews you could probably find it. I borrowed it from my library.
You can't really rebatch melt and pour in the usual sense. It would just melt again. However, if you don't want to work with cp, melt and pour is a great option. You can find lots of info on the internet. I really like the soap queen videos. She gives great information. Brambleberry (soap queen owner) sells nice melt and pour.
Brambleberry also sells soap for rebatching and has directions. That is a cp soap already grated up for you. I never used it, so I can't personally vouch for it, but seems like a good option if you don't want to make cp.
I will offer my opinion that rbatching is harder than cp, at least I find it so. Takes so long to melt the soap into any semblance of something smooth and moldable. However, if you are not in a situation where you can safely work with lye, it, (or melt and pour) would be a great option.