Refreshing New Data from Excel - Need help!

Hi All,

I have a scenario here where I have been loading data from MS Excel in to Power BI for daily reporting. Every day the table should only be loaded with the data that I prepare and power BI should retain the calculated columns which are already in place.

In other words, I need to ensure that older data is deleted and only the newer data should be displayed in the visuals.

1) I tried, deleting the rows which didn't help.

2) If I add a new source then I have to manually involve in adding custom columns.

Is there an easy way to refresh data in a way that I expect, which is, to completely delete the older data by introducing the newer ones?