You can tag files and tasks. Tagging helps to group objects together which is useful for search and keeping things organized. You can assign multiple tags to each tasks or file. As an example, you can assign several tasks a tag called Bug. Then for some of those tasks add another tag called Priority 1, for other tasks assign Priority 2 and so on. This way you can group all bugs based on their priority and search for all bugs with priority 1 for example.