I have zero experience of web programming, so can't help with the
details. But the way I'd do it would be to store the Word documents
(maybe after converting them to HTML or PDF) in a folder or folders on
the server. In the database, I'd just have a table structure along these
lines:
tblReports
ReportID
FileName
Fields storing the period the report covers
tblStores (probably you already have this)
StoreNumber
other fields
tblRegions
RegionID
other fields
tblReportsRegions (which reports refer to which regions)
ReportID
RegionID
tblReportsStore (which reports refer to which stores)
ReportID
StoreNumber
....or maybe
tblStoresRegions (which stores are in which regions)
A structure like this will support a user interface that lets users
specify the regions, stores and dates they're interested in, and then
generates links to the relevant reports.