You can create custom actions using HTML or Script file to perform a custom action on requests. 
To create a request custom menu: 
1. Go to Admin>>Helpdesk Customizer>>Request Custom Menu.
2. Click Add New Menu.
3. Provide Menu Name and Description.
4. Associate roles:
Choose All Roles to associate the custom menu with all roles. 
Choose Select Roles to then add one or more roles using the combo box.
5. Associate Templates: 
Choose All Templates to associate the custom menu with all templates. 
Choose Select Templates to then add one or more templates using the multi-select box.
6. Add an action: You add an action to be performed using the custom menu either using an HTML file or a Script file. 
7. Finally, click Save. 
 The custom menu will appear in the request details page under Custom Actions dropdown depending on the selected roles and/or templates.
The custom menu will appear in the request details page under Custom Actions dropdown depending on the selected roles and/or templates.  You can enable or disable a custom menu by clicking the green checkmark against the preferred custom under Admin>>Helpdesk Customizer>>Request Custom Menu.
 
A typical custom menu creation form:
 
 View, edit, disable, or delete custom menus
 
You can view all custom menus under Admin>>Helpdesk Customizer>>Request Custom Menu. 
To view the details of a custom menu, click the menu name.
To edit a custom menu, click the menu name (or the edit icon) and make necessary changes then click Save.
To disable a custom menu, click the green checkmark against the menu.
To delete a custom menu, click the delete icon against the custom menu.