Newbie on SQL & Excel

I'm new to SQL but not Excel

I was given a Excel spreadsheet with Employee names.  I have a large
database with a Personal Table with Employee names and a whole list of
other tables that I'm used to running queries.  I'm still new to
queries.

I can run queries using the Pers_Table with employees and other
tables.  How can I im****t the Excel sheet and use it as the Pers table
with only the names of the 10 employees listed in the Mainframe ex****t
of Employees.

My files:
Mainframe.xls for 10 mainframe users.

My tables:
Auth_id for user id's
CostCtr for Cost center codes

I'm attempting to do the above in MS Access.

Is there a way to do the above via SQuirreL SQL(an open-source Java
SQL Client program) on a DB2 database?

Thanks..