All things related to "paging" are the domain of the parent report. To
simulate a PageHeader in your subreport that will show up in the parent
create a top-level Group section based on a constant (=1 for example) and
set its RepeatSection to True.
Repeat Section tells Access to repeat the section on each new page if a new
group hasn't started. Since the group is based on a never-changing value
the section will appear on every page and this will carry over to the parent
report. Doesn't work for footers unfortunately.