In Marg Software, there is no need for the user to exit from the Sale bill window in order to change bill calculation. The user can easily change the calculation of bill at the time of creating the sale bill by following the below steps:

• Firstly, the user will press 'Page Up/Ctrl+R/Alt+E' key on it.

• Then the cursor will move to the party name name.

•  Press 'Enter' key on it.

• A' Change' window will appear.

• In 'Bill Calculation', the user can change the bill calculation as per the requirement.

• Suppose Change with '2'.

• Then press 'PageDown' key to save the changes.

After following the above steps, the user can change the bill calculation at the time of billing.