Using the navigation bar will not be an option, since that is defined via StudioPro.
What you could do is create an import from your Excel file to store the values in tables (incl. hierarchy). You would be able to display them in related list views, but if you want to have some drag/drop functionality, you may want to look into adding a widget and/or take a look at this sample project
Alternative solution and sample.
Question remains how you to integrate updating the excel and (automatically) update the (also changed) records in your app.. My suggestion there would be to first get it working manually (create the logic) and then look into creating a Scheduled Event to trigger the logic (including uploading new versions of the Excel file to your app).