You must first have created an excel file, either with the program (see here), or manually. In case of a manually generated file, it must have exactly the same structure as a file generated with the program.
Make sure Excel is closed before importing.
Go to Import salaries from an excel file :
Choose the excel file :
Click on open.
Click on check. The program will check the integrity of the excel file.
Then click on Run. The program imports the data.
The result is the same as if you had entered the salaries by hand in each employee or used the selective update.
What was imported is colored in cyan like the manual entries: