Please explain. Excel is a spreadsheet; Access is a relational
database. An Excel Workbook is a very different object than a set of
related tables!
You can *import the data in a spreadsheet* into an Access table, using
File... Get External data... Import from the menu. Select Excel from
the "files of type" dropdown. However, the spreadsheets will come in
*as data*; Access tables do not support expressions in fields (you
would use Queries instead).