Flexible tuning of the user access

[Beast]

Hello Everyone.

I'm using Zabbix almost year and now I'm encountered the problem with granting access rights to users (guests).

The problem in the following:
- I need to provide access to several graphs that are associated with different hosts. An example of this is the model of Cacti user acces.

The task is to allow viewing of different information to different departments.

For example:
I have hosts with services:
- Host A have NFS, HTTP, AJP;
- Host B have AJP;
- Host C have HTTP;

Also I have user accounts (guests):
- user_a;
- user_b;
- user_c;

I need to provide only this graphs for this users:
- To user_a I need to provide "Threads count" form Host A, "Busy workers" from Host C;
- To user_b I need to provide "Free disk space" from Host A, "Threads count" form Host B;
- To user_c I need to provide "Bysy workers" from Host A, "Bysy workers" from Host C;

Give me whether I can do that, if not the standard means, it may be making changes to the database.

Thanks in advance for answers