Issues log - expand or minimise secondary tasks

Hi

Within Excel 2007 I'm looking to create an Issues log with a "primary task" row showing high level details, then underneath that each row will represent the underlying actions or updates (the "secondary data")]
I'd like it so that the user would not see the secondary data unless they were to expand upon a Primary tasks...almost like the functionality used within MS Project, where you see the primary project steps but have to drill down into the underlying tasks.
I'm looking to create this for my own time-management, as I run with a number of issues day-on-day within my firm and I want to keep track on where I am, or to prioritise what I'm looking at right now. I'm most comfortable in Excel (believe it or not) hence my question.

Would appreicate your help, or indeed anything already out there that you feel may assist me.

Thanks guys.