I'm currently using the Professional account in Zoho CRM and I'm trying to figure out the permissions and access to data. 

I've read almost everything in regards to this but I still get confused by who can access what information in Zoho.

So let's say that a CEO (Admin) and a Manager (Admin) wants to share only certain contacts/data with some of their subordinates, how can I achieve that in a Professional Account?

Also, if I have a group of people who have to be able to access certain information, for example, the team of a CEO, Manager and Manager's Assistant are a team working on a project and they need to be able to see/share only certain contacts/records which the other users should not see. 

Is this something that can be done in Zoho CRM Professional plan?

Just a simple explanation of all this permissions/access will be really helpful.

Thank you for your help!