Suppose some bugs appear in versions of your software both for Windows and Linux. The versions for different platforms are being developed by different teams and you need to track the bug fixes individually for every version. There are two common ways to ensure this: 

• You can add to the system one issue, add notes about the systems in which it appears and track the status by adding more notes. This way you cannot track the exact time of fixing the bug, the time spent for each OS, etc.
• You can make individual copies of the issue for each OS. In this case you will have problems tracking the total time spent on this issue and discussing the problems common for both platforms. This method may also lead to numerous bugs and problems in managing them when the bug becomes apparent in later beta versions of the product.

In TrackStudio you can create several versions of each issue (in fact, each of them is a lower level task of a special kind) and set up individual properties (handler, access rights etc.) for each of them. You will be able to view both the general information on the issue (e.g. the total time spent on fixing the bug in all versions) and the version or configuration-specific information (e.g. the list of all bugs not yet fixed in the Windows version or the list of overtime issues).