It depends exactly what you mean.
It sounds like what you're saying is that you want a different response based on different criteria (which user logged in, etc).
The easiest way to do this is to setup Fulfillment for the welcome intent and, in that fulfillment, evaluate the different criteria. Based on the results of that evaluation, you can send back something different.
You can do that with the usual libraries, or with a library such as multivocal (
https://multivocal.info) which is designed to let you set different "outents" based on the criteria you set.
Allen