Help with creating a new measure or column

Hi,

I am not sure how your semantic model looks like, but I tried to create a sample pbix file like below.

Please check the below picture and the attached pbix file whether it suits your requirement.

Expected result measure: =
VAR _workhours =
    SUM ( Data[HoursWorked] )
VAR _fte =
    SUM ( Data[FTE] )
VAR _noofmonth =
    SELECTEDVALUE ( Period[No of Months] )
VAR _result =
    DIVIDE ( DIVIDE ( _workhours, _fte ), _noofmonth ) * 12
RETURN
    _result

Hi, 

Thank you for your message, and please check the below picture and the attached pbix file whether it suits your requirement.