You can set up company groups to define a logical grouping of companies. You can link a company group to a table setup record of a field security policy. The assigned company groups define the companies to which the table setup record applies.
Steps
Go to Dynamic field security management > Setup > Company group.
Click New.
In the Group id field, type a value.
In the Description field, type a value.
Sub-task: Add companies to company group.
Expand the Company group line section.
Click New.
In the Company field, enter or select a value.
Close the page.