Allow to Override Slab Percentage : If you don't want to make any change in the slab percentage then set this field as "No". You can override or change the percentages already given by setting this field to "Yes".
Show Pay Head Type : If you want to display the Pay Head Type in the Salary Details Screen select this field as "Yes". If you don't want that set "No".
Show Calculation Type : If you want the Calculation Type of the selected Pay Head to be shown on the Salary Details Screen then set this field to "Yes" or else set it "No".
Show Computed On : Set "Yes" if computation details, if any for a Pay Head is to be displayed at the Salary Details Screen. If not select "No".