A shortcut button can be set on sales screen to call any other screen

Maintenance > Resources
To call customer debt payments screen from sales screen, add the below line in Ticket.Buttons and restart.

<button key="button.print" titlekey="Debts" task="com.posics.pos.panels.JPanelCustomerDebits"/>

Change task value to other class name, to call a different screen. Class name can be copied from Menu.Root.