Clean Data in Power BI

i need help on cleaning this data. Currently I’ve no idea to clean this kind of data. I want to clean based on month and total per supplier. Thanks

>Solution :

1. Select the first 2 columns [No] and [Supplier]
2. On the tab Transform drop down Unpivot Columns and click on Unpipot Other Columns

This converts your wide pivot table into a long, stacked format that is ideal for further processing.