When you are planning to live and work in the United States, you will have to make sure you are filing the proper paperwork. The entire process starts by having a company sponsor you for a visa, and then you have to file relevant applications and present documents so that you can make your case to the relevant organizations within the US government. Part of this process for getting the l1 visa in Toronto, ON or some other visa is that you are presenting a completely accurate account of yourself. Do not think you can embellish to get a visa, as that is a mistake.
What you must do is be completely truthful in every aspect of the application. Do not lie or omit some details, as you are running the risk of them finding out what is going on. They are going to find that information and they will use it against you, which could lead to a denial. Rather than taking that risk, you are better off talking to an immigration attorney about your application and then putting it forward with everything filled out accurately. Being honest will help you immensely with the application process.
Another reason why having a lawyer is so helpful is because you will be in a much better position when it comes to correcting any errors, or providing additional documents. Perhaps you get a response from the US government and they want some more forms sent. That is a common request, and it is one that should not cause you to panic. You should be able to get the documents they need, and they will be satisfied that you have presented all the relevant evidence. Having a lawyer to help you will ensure that you are doing everything in the right way and not getting your application rejected.