Feel free to contact QuickBooks 24/7 Support Number to get answer to all questions related to QB functions ,There is no limit to adding companies in your QB Pro versions , You can manage 3 companies Books with QB Pro version .But in my suggestion you need to try QB Enterprise version because when company number increases in QB Software , performance will down . Each time you add company , QB reduce the size of each company . So the RAM will effected and process will slow .
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