How do I modify Other Charge and Other Discount Master?

Scenario: I want to change calculation method of Other Charges and Ledger of Other Discount. I also don’t want to add other charges to product cost.

In order to implement above feature you please follow the steps as given below;

1. Go to the Charges Master (M A D)
2. Press Alt + D (Display)
3. Go to Other Charges row
4. Under the Head "Method", Press Alt+L and choose a method from the list
5. Under the Head "Add In Cost", Press Alt+L and choose No from the list
6. Then go to the Other Discount row
7. Under the Head "Ledger", Press Alt+L and choose a ledger from the list
8. Now Press Alt+S on Display Screen
9. Click yes when it asks for "Confirm Entry" to save the changes.

For more detail please check the link given below;
http://www.rancelab.com/help/fr6_charges_master.htm