hi

I want to ask about import data, here I want to import data from Excel, previously I have tried it but the results are double. For example in the picture below, in the column or field 'Number of Days' all employees are 0, now when I import data the column or field 'Number of Days' has been filled for example 24, but what happens is that the old data still exists instead of the old data overwritten with new data. How can I import the data so as not to produce new data, meaning that the old data is overwritten with new data.

thanks,