One need to perform below mentioned steps to generate an invoice for newly added package:
1) Login into the Modern Bill.
2) Search the client for which one need to generate the invoice.
3) Check the package status and change it to on.
4) Click on generate invoices from stats/actions section and new window will appear.
5) Select the days before renewal from the drop down list.
6) Select no button for send mail.
7) Click on submit.