Doc Map, Navigation, how do they work?

There are document map labels *everywhere* ... on the navigation tab
for a list box ... on the group tab for a group within a list/table ...
navigation tab on a table ... on the field level.  I have been trying
to understand how and when to use these.  Just when I thought I had it
figured out ... another issue came up.  In some cases I am *hiding* a
table or list but it seems the document map label shows up in the doc
map even though the table or list is *hidden* ... this isnt acceptable.
Please can someone shed some light on this?  In this report I have 2
tables and a subreport and they are nested within lists as follows
(because of the order they need to render)

List 1   Resource Group  (think of this like country)
no data regions .... just used to contain other lists

List 2   Resource Name   (think of this like State)
summary table - this  has summary information for a resource

List 3 (filtered by downtime > 0 )   Resource Detail
detail table  - this has detail outage info
subreport  - diff data source which contains comments related to
detail.

List 2 and 3 are hidden when there is no downtime for a resource

I am noticing that even though List 2 and 3 are supposed to be hidden
(and I even have the expression on the tables to hide the tables too)
.... I am still seeing the doc map tag if I dont put the "hidden"
expression on that as well.  This doesnt make sense to me.  If a data
region is *hidden* ... isnt everything HIDDEN?

another thing I noticed ... I am rs2000 SP2 and it seems that the field
level document map label appears for every group even though I have the
"hide duplicates" checked and the scope is the dataset supplying the
content.  Another thing that doesnt make sense to me.   Please if
someone can help clear this up it has been taking way too much time!!!

Thanks in advance.