Burn Down Chart PowerBI

Hello, 

I'm tring to create a burndown chart since one week. 

I have read all the document available in this community but when i try those response it does'nt work in my case. 
I'm also new in powerBI.

First of all I extract my data from Jira.
*An extraction corresponds to a single sprint

In my extraction i have 8 columns: 
ID Jira, Ticket status,  Date of creation, Resolve date of the ticket, Businness value, Sprint planning, Sprint start date, Sprint Finish date. 

Sprint planning column tells us if the tickets was planned or not. If there's an "X" in the colum it means the tickets was planned if not it isn't.

I have already created a new table date wich have all the date from the Sprint start date to the Sprint Finish date.

But i'm having trouble calculating the remaining business value.   

 I really need help. 

If you would like more information, please let me know.