Flow to Read/Extract Data from PDFs/HTML/XLS with AI Builder

Hi,

I've built successful flows with the AI builder I'm having an issue with an export from Excel and PDFs that does not have a defined table and has additional rows. What's the best practice for an Excel export (CSV) to be able to extract the data with a table that is not defined as a table that may change in length. The column names are static as are the rows before the table starts. Again, the export is simply a CSV.

Appreciate any insight.