To link existing users to Companies is necessary to define their role and responsibility, particularly in the case of Subcontractors where you wish to control their access.
It is important to set the permission or ACL - companies:sub_contractors_rights for the role to make sure they only see what is required.
To link a contact to a Company
- Go to Contacts
- Select Companies Rights
- Select the user
- Select the Company or Companies they belong to