calculating percentage of sales for promotions

Hi All,

Hope you are doing well!.. I have a dataset that has the vendor information along with if the vendor had sales promo (Yes)...Basically the Non promo sales is identified by No and the promo sales is identified by Yes...If the vendor has both promo and non promo sales it has both Yes and no and the overall sales is identified by the sum of Yes and No sales for the vendor...

Now I need to create the output in the (present in the second tab of my attached sheet....-Expected output)..

1) that identifies the vendors that have had promo's and calculates the total sales for 2 different timeframes , the promo sales for two different timeframes and calculate the percentage difference...
2) Now if the vendors sales is only through promotion Yes then its total sales is equal to the promotion sales..

Can you please help me with a Power query for this !..Really appreciate your help!!...