How to calculate NET EXPORTS. Plesae help

Hi Kannan4444 - you have measures to calculate Total Exports and Total Imports. Based on your provided measure for DischargePortQuantity

change the table and column names as per your model . 

TotalExports =
CALCULATE(
SUM(BaselineView[KT]),
FILTER(
BaselineView,
BaselineView[DischargePort] IN VALUES(BaselineView[DischargePort])
)
)

For Total Imports, if there is any filters conditions you can apply assuming loadport here

TotalImports =
CALCULATE(
SUM(BaselineView[KT]),
FILTER(
BaselineView,
BaselineView[LoadPort] IN VALUES(BaselineView[LoadPort])
)
)

calculate Net Exports, subtract the Total Imports from the Total Exports

NetExports =[TotalExports] - [TotalImports]

Hope this helps. 

if any share some sample data to analyse further.