Series Of Questions...subtotal Navigation, Etc.

Year
May April March Feb
Site
Manager
Direct Report A 1
Direct Report B 2
Direct Report Unknown 3
Total 6
Total

Hi everyone,
I know this question has been asked several times in the forum, and I've tried to use the examples given, however, I cannot make them work for myself so I'm finally posting my question. I hope someone can help me out as well

Report Name: Passive Theft - Summary
Report: This is a rolling 12 months report (it is a matrix).
Row Groups: site (location), manager, direct report (for each manager)
Column Groups: Year, month > this is for all work orders
Overview: The counts showing on the report summary shows how many passive theft audits were found, in a period of time (year and month) on a person's work orders (which where the Direct report information is derived from)

Just like prior posts, I need to be able to drill down from the summary report (which shows counts of audits) to a detail report that will show the individual work orders depending on the number clicked (non-subtotal and subtotal in the matrix). My detail report is called "Passive Theft - Detail", and this is the report I'm pointing to in the navigation option - jump to report.

What I have done so far is that if I just pass the year, month, site, and direct report as parameters to detail report and I get the correct detail (in the report, this would be clicking on 6, any of the aggregates by the manager line). However, if I click on 1, 2 or 3, I obviously just get the result for the whole manager group again, which is just 6.
Can you please show me a code on how I can accomplish passing on the correct values an getting the right detail?

Second dilemma: We have a lot of contractors employee information that have been purged from the system, which could possibly still have work orders attached to them, but their name just wont show up in the report. In my SQL, I use the ISNULL function to show these purged contractors as "Unknown". So say for the Sample above on Direct Report Unknown which = 3, if I click on that, I may click on that and only get 2 details in the Detail Report because 1 other detail has been purged out of the system. But if 2 are available, I would still like for them to show for the unknown contractor.

Third dilemma: An employee may still be present in the system, but the work order information could be purged already and so if you click on Direct Report A, as an example, he woudln't have a detail for that work order even though he has a count of 1. How do I resolve this?

I know this is such a long question but I really need help I hope someone can enlighten me Thank you!