I've run into a snag as of late trying to find some songs to add into Rocksmith. A good amount of songs I have been looking at all have multiple guitar parts. For example, one would say that it has three different guitars in one song. So my question is, how do you work with a song like that? Is it simply impossible or is there a way around it?

Bonus arrangement are made for that.

Bonus arrangement are made for that.

 

could you explain? Like I know about the feature and that its used on certain songs, but can it be used on the custom songs as well?

In the toolkit when you create a cdlc you can choose to put the arrangement as a bonus arrangement (i don't think there's an actual limit to the amount of bonus arrangement). So if you already have a lead arrangement you can add another lead arrangement as a bonus one.