Another way is assign all of the tasks an additional category name. For example, right now I have several things I'm working on to help me with a large proposal... so I have ^XYZ Proposal as a new category. Individual tasks for this project, such as "Call Karen for meeting dates" would have categories of @calls and ^XYZ Proposal.
Then, in Outlook, I can sort by categories and get a list of tasks by context and a list of tasks by project. I use @ before all of my contexts and ^ before all of my projects, so I get all of my contexts on top and all of my projects on the bottom - all in one long list. Then I collapse/expand for whatever I want to view. "Call Karen for meeting dates" shows up on both my @calls and ^XYZ Project list.
Julia