Hi there, @laetitia.huas… maybe I am missing something, but what you described (if I understand it correctly) is not how you want to do it. You should have a data type called Company in which you store the data about each company, and one of the things you might store is a list of users who work at the company. You could also have a company field (which links to the Company data type) on the User data type, and that field would store each user’s company.
With a setup like what I described above, you will be able to accomplish the desired behavior of dynamically showing the right company data to each user. Make sense?