Can you merge existing Excell Spreadsheets with Access?
Please post a more detailed question.
Access is a relational database; Excel is a spreadsheet. They are
DIFFERENT; Access isn't a "larger version" of Excel.
However, you can link Excel spreadsheets to Access, import them as
Access Tables (which look like spreadsheets but aren't), merge them,
reexport them to Excel, and generate reports and forms from them.