David,
If the goal is to have a SAS program that can import the Excel file directly, you will need SAS/ACCESS to PC Files (there is a version for Unix that uses a mechanism called the PC File Server) and run PROC IMPORT.
EG uses the data access features built into Windows to read the Excel file and copy its contents to the SAS session. There is no SAS code that captures that work.
In EG 4.2, you can elect to have the Import Data task include the Excel records in the generated program as DATALINES (inline records). That creates a complete SAS program to create a data set, but it does not go back to the original Excel file when you re-run the program. Without SAS/ACCESS to PC Files, it's EG that does the work of extracting the contents from Excel.
Chris