I'm not sure I understand your question very well. But I'll answer what I believe is your question.
Whatever visa you use to enter the US, that is the status on which you remain in the US and the employer with whom you must be employed.
So if you enter with an L1 stamp, you are on L1 status. If you enter with an H1B stamp, you will be on H1 status. In either case, you only can change to the other status if your employer applies for a change of status and gets an approval of the same, after you've entered the US.
Does that make sense? And does that answer your question?
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