help needed with a measure

Hi All,

I am looking for a measure in power BI desktop that will allow me create a sum of various rows based on specific criteria.

The criteria being the name of employee and the start of week date (first and second columns in the sample below)

i need to calculate how many hours are being worked by the same individual on the same week and have that info displayed into a new column (column 7: total hours)

The reason why i need this displayed in a new column is because i will then use that input in column 7 to create a new formula in column 9.

i am good to go with the latter part of the exercise but my problem is that i am not being able to come up with a way to give me the sum of hours per week per employee.

your help is appreciated.

Thank you.