Bloodline trait = something you can't be taught like the Sharigan or the Byakugan or (in part 1) special elements like ice or wood styles
Learning to use multiple elements = Something you can be taught to use according to what we just learned
Both of these things were called Kekkai Gen Kai
These two things don't go together
Learning to use multiple elements is something most people can do. Combining them is special and called a kekkei genkai I believe.