Hi scogordo,
From your description, my understanding is that you want to import a multi-sheet xls into a SharePoint list.
By default, when we import data from an excel file into a SharePoint, we just can import data from a spreadsheet, not multi-sheets. As a workaround, you can try to insert data from multiple spreadsheets into one main spreadsheet, then import the main
spreadsheet into a SharePoint list.
About how to insert data from multiple spreadsheets into one spreadsheet, you can refer to:
http://smallbusiness.chron.com/insert-data-multiple-excel-spreadsheets-one-excel-spreadsheet-75667.html
If you just want to display the data of multi-sheet file in SharePoint, you can also upload the file into a library, then use Excel Web Access web part to display the data from the file.
Best Regards,
Wendy