One need to perform below mentioned steps to add package to the clients account:
1) Login into the Modern Bill.
2) Search client for which one need to add the package.
3) Go to the client order details page.
4) Click on Package Wizard from stats/action section.
5) If you want to add the package for an existing domain then you can select the domain from the drop down list otherwise enters the domain name in domain name field.
6) Select the package from the drop down package list.
7) Select the package billing cycle.
8) Click on submit button.