I just downloaded Trello today and liking it so far. I am thinking about switching to business and I was wondering if there is a way to lock some items in the attachment within the same card so that only certain employees can see it. For example, if I upload 2 attachments namely "Job Estimate" and "Job Scope" and I want all 15 employees to be able to open "Job Scope" but only give two employees access to "Job Estimate" but I want both to stay in the same card within the same list. Is this doable with the business account?