Add custom fields to bug reports

One thing that prevents me from saying this tool is perfect is the fact that I can't add custom fields to the bug reports.

For each projects, the fields could be different.

Per example, we usually specify which section of our website has a bug or improvement request.

Right now, the only way is to enter it manually in the description or title.

There should be a way to add subcategories that we can select from when we add a new bug.

Thanks,