You'll need to work out what data structure (tables and fields and
relationships) in Access best fits your data and the use you want to
make of it; then create that structure and import the data into the
table(s).
If the 9 "branch" worksheets all have the same structure and the only
difference between them is the branch they refer to, then it's best to
use just one Access table, with an additional field to specify the
branch.
To do that:
1) create the table with the additional Branch field.
2) Use File|Get External Data|Link to link to the first"branch"
worksheet
3) Use an append query to move the data to your main table. In the
query, use a calculated field like this:
Branch: "Name of branch"
to generate the value for the Branch field.
If the "regional" worksheet is just totals of data from all the
branches, it's probably not necessary to import it. Instead, you'd use
queries to aggregate the branch data as and when required.
It may be worth reading up on database design and normalisation. See
e.g.
http://home.bendbroadband.com/conradsystems/accessjunkie/resources.html#DatabaseDesign101