I use a work breakdown structure (WBS), which consists of tasks numbered 1.0, 1.1, 1.2, 2.0, 2.1, 2.2, and so on. In worklog analysis, I need to be able to quickly aggregate all the times for each task, and I need to do so for a specified task. For example, if I have 3 worklogs for task 2.1, I want to see a total time for task 2.1 rather than 3 worklogs.