The process of applying for an L1 visa will be determined by whether you are applying as an individual or a company. 

Can dependents apply to come to the US with the main L1 applicant?

What are the L-1 visa eligibility criteria that must be met for a successful application?

Does the L-1 visa lead to a Green Card, and US permanent residence?

Is it possible to apply for an L1 visa extension?

How can you apply for an L1 visa transfer to another US visa type?