Hi Silent,
Create a formula with this code:
{@5% Commission} + {@AWB Fee} + {@Freight} + {@FSC} + {@Handling Fee} + {@Others} + {@Processing} + {@SSC} + {@Trucking Fee}
Go to the Insert Summary option > choose this formula field as the Field to Summarize > choose Sum as the summary operation > under summary location, choose All levels.
-Abhilash