I plan to have multiple sites/compaigns. My Question: Is there a way to set up a limited account that one client would be able to view just their campaign?

[darylgochnauer]

I don't want a client to be able to see all of our other campaigns, just theirs. Is there a way to set this up?

[Ray-pp]

At this time, Moz does not provide access from multiple users to a single account. It is on the product roadmap and a very popular requested feature, but we haven't seen it added to the service as of yet.

Currently, you'd need to email separate reports to your clients.

Source: https://seomoz.zendesk.com/entries/20199538-is-there-a-way-i-could-add-another-user-to-access-my-pro-account