how to sssign user access to particular comapnies

Dear all,

I’m trying to assign user s  to specific companies as below mentioned.

Scenario :

three companies  : C1,C2,C3.

Users:  U1,U2

Access for  the companies to the specified   user should be like this.

I have created three domains and mapped to the User Groups and then assigned to the users  but it failed.

Could you please guide me out on this?

Thanks,

Krishna