Merging corporate and personal points

Hello everyone,

I am wondering if anyone has experience with this or knows the answer. I know someone who is the CEO/owner of a company with about 120 employees. They have a corporate account with American Exress, several of his employees have the basic green card, he has the corporate platinum. He is the only one that can use all the points that come from those cards. He just got the personal platinum and he’s interested in merging those points with the corporate account so all the points are together. I confirmed that he can link his corporate platinum with his personal platinum, is it possible to link this card with his entire corporate account so everything is under one umbrella? I can’t find a straight answer online.