title: Restrict User To Specific Entities In CRM
body: <p>I am new to CRM Environment. I have Guest Login and user role for my client. I have a lot of custom entities in my Microsoft Dynamics CRM 2015 online. I want to give access to my client to some specific entities so he can play with it ,  without messing with my other entities.</p>
  
  <p>I want that when my client logs in he can only view one custom entity in the site map. Nothing else ! 
  Any ideas?  </p>