Adjusting the program interface is possible for each user separately and is effected by setting various options.
1 company is slready contained in a base program license. Here you should put a number of extra companies that could to be used simultaneously in one program database. Further, while ordering on this site you will have to indicate exact names for each company in the license.
1 user is slready contained in a base program license. Here you should put extra users that need simultaneous access to the program database.
The composition of a program package depends on requirements in your company and determines the final product cost.