Filtering false positives in Fortify

What is the best way to filter out false positives in fotrtify to ensure they never come up again for the current and all future versions of a project folder. I found a video on fortifyunplugged where this was done via audit workbench. However it appeared it was limited to just that project folder version. Is filtering via AWB the best method? Is there a way to do filtering directly in fortify SSC? I can suppress vulnerabilties but they often re-appear in future scans.