I finally got this to work, but I can’t use Excel, there is something with the formatting. This is what I did.
1. Export a sample file.
2. Open in Excel > convert to columns.
3. input my own data in the columns.
4. Save as Tab Delimitated .txt file.
5. Open original export file in a Text Editor (Text Wrangler). Leave the headings and delete the rest.
6. Open the Tab Delimitated .txt file in a Text Editor. Copy all the match info and paste into the original exported .csv. Save.
7. Import the original .csv with the new match info.
Hope this helps so others!