In Marg Software, there is no need for the user to exit from Sale bill window to modify sale bill. The user can easily modify the new sale transaction at the time of creating sale bill. 

• Firstly, the user will press '~' key on ledger window.

• A 'Modify' window will appear.
• The user will select the options as per the Requirement i.e. bill no, bill date etc.

• A 'Sale As On' window will appear.
• The user will press 'Enter' key on the selected entry which needs to be modify.

• A 'Gst Invoice Alteration' window will appear.
• The user will click on 'Modify'.

After following the above steps, the user can Modify Sale Book while billing in Marg Software.

1. Firstly, the user will Press 'F3' key on blank line.

2. Thereafter, a 'Modify' window will appear in which the user will select the options as per the Requirement i.e. bill no, bill date etc then press 'Enter' key on it.

3. Now all the created sale entries will get display then user can make the changes as per the requirement.