I may need a bit of clarification in order to answer your question - are you importing the Excel files locally or from a shared area like Sharepoint? Paxata does not support the automation of local file imports into our Library (don't want the server reaching out to individual desktops) but we do support automated import from enterprise sources (SFTP, Sharepoint, S3, WASB, databases, etc.). If you load the latest version of the Excel file into the Library, either on demand if a local file or on a schedule if enterprise system then you can create a project which starts with the original file and Appends the updated file. When there is a new updated file in the Library you will notice a "refresh datasets" button at the bottom of the Steps panel in the project turns green. You can select this option and then choose to update the latest version of any new datasets in the project. You can also set automation options to use "latest version". Does this help? Please let me know if I can provide additional clarification.