Need flexibility on using Excel as datasource

I found this tutorial:
Is it just me or there simply no flexibility if you need to predefine data area (named range) before hand? Most use cases you'd want to automate ETL, and thus data source must support varying number of entries (rows) at the very least.
Is there any work around for this?

For Excel this are the steps.
Look into this link -
1. Create a DSN in ODBC
2. Create a connection in Data server (topology) using sun odbc-jdbc driver
3. Reverse the Excel using the selective reverse. While handling multiple sheets ODI defines them like a table (datastore) and names are populated based on sheet name say if sheet1 then Sheet1$ ,Sheet2$ and so on.
Now you can use them as Source Datasource and use it in the interface as we do with other RDBMS datastore.

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