How to Grant Access to Your Facebook Page
Working with an advertiser or consultant? Don't share your login details, instead use Page Roles to assign the appropriate access. Go to your Facebook Page. Click on "Settings" and navigate to Page Roles. Enter the person's name or email and select the role from the dropdown menu.
Tracking Multiple Subdomains
Make sure to add the root domain to the Referral Exclusion List. Admin tab .. Tracking Info .. Referral Exclusion