Field mapping

When uploading a spreadsheet on the plugin i am asked to select the field in the field mapping section, then chose one of the options of “import as’. I’m not sure exactly how to implement this in my table, or if i can bypass it? The spreadsheet that I am looking to import has about 50 columns going across, all headed with different names, and their stats directly underneath them, about 60 rows going down. Initially I thought that I could select ‘title’ as ‘import as’ for all of the names, as this seems like the best categorization, but i see that i can only select each ‘import as’ field once. How do I maneuver this so that i can upload the table while keeping the layout intact, so far i’ve not been able to get to the next stage where i can see how the table would look as I am stuck on this first page.