If you prepare import data in MS Excel sheet ( *.xls or *.xlsx ) you can import them directly from the file.
Open Excel file you want to import from. See more in How to import data.
Select particular Sheet (in case your file consists of multiple worksheets) and click [OK].
Following Import window opens.
If needed, set up options and map all relevant data fields.
When all fields you want to import are mapped, you can click the [Import] button and import is done. You can start to work with data.