Hi,
On what release are you?
do you use the embedded SA or a standalone install?
I don't think this is possible by default at the analyst level.
You will need to create a specific Support automation Access level (under Adminstration/security and role management node) and set the queues available there.
Then you assign this SA Access Level to a Role and the Role to an Access Type or individuals.
Not really nice to manage as depending on your case you may need to create/manage several access/roles.
The only way I see to be able to segregate in a more dynamic way at analyst group level will be to use data partition.
Hope this help.
/J