How to create price difference chart of 2 suppliers in Power BI?

[KevinYan]

How to form a line which shows price difference of supplier A and B, they are not alway have same offering date?

raw data would be 

	A	B
1/1/22	11
1/2/22		14
1/3/22	15	18
1/4/22	16
1/5/22	13	19
1/6/22		17
1/7/22	20	26

[KevinYan]

raw data would be: (more clear below)

	A	B
1/1/22	11
1/2/22		14
1/3/22	15	18
1/4/22	16
1/5/22	13	19
1/6/22		17
1/7/22	20	26

[BeaBF · Accepted solution]

@KevinYan You can create a measure and add it as new line in the chart:

Measure = SUM('Table (2)'[A]) - SUM('Table (2)'[B])