[LizPf]

I mix them.

So in my Daughter's SF Con Costume" Project, I'll have the Task: list materials needed. But under the sub-task Purchase Materials, I'll have each item be a task, so I can check them off as I buy them. Furthermore, if I haven't bought something, it will show up in purple as a Next Action, meaning I have to get this item before I can move forward.

Of course, if I'm doing something that has lots of this type of thing, I'll link to an outline. I have an outline I've refined over the years for Kid birthday parties -- since it contains spaces for guest lists, RSVP check boxes, and grocery lists, OmniOutliner is a better way for me to keep this info.

--Liz