Is there 2 versions hooked into 1?

Do you mean as one book, e.g. The bible ?

Not sure what you have in mind. Can you expand a little?

The Old Testament is the story of God's dealings with the Jewish people, the New Testament tells us about Jesus Christ and his followers. The Old Testament is important because it outlines the principles which are expanded on in the New Testament

Do you mean like the NEW and old... e.g.. The Bible...
Expand a little

Not sure who your question is directed to; asker or responder but the only testament I am aware of which is referred to as both new and old is contained in the Bible