Hansoft offers extensive functionality in giving and restricting access to bug column data and other parts (like deleting bugs, importing XML, documents or customizing the workflow and more).
Bugs can be hidden for a specific user or user group when a bug has a certain custom column item selected (for example custom column Hidden set to drop list item Hidden Yes, hides the bugs from user group "Outsourcing partner").
The rules are global and affects all members (even Main project managers) and all views (Bugs reported by me, All bugs and the To do list).
Note: Only Main project managers can change detailed access and restriction rules.
In the example below we've restricted "Team A" from deleting bugs as this should be done by a team lead.