If you were able to articulate a coherently phrased question you might get a better response. However, in answer to the question I think you were trying to ask, you are simply taking two separate bass signals into a recording device - one from a microphone, one from a DI box. Each has a different set of sound characteristics and when you mix down you use a blend of the two according to taste.
Which is exactly what grinder said, I was just being more patronising because you are clearly too lazy either to think it through yourself or ask a question specifying your problem.