Looking to customize an AX2012 list page grid view column for users that would query and return: open transactions amount short paid on the All Customers list page grid. Is this possible using the add fields feature and entering a query within system name?
It is not possible to achieve that requirement by using the Add fields feature from the Personalisation form.
You would need to create (develop) a new display method in the Customers (CustTable) table (if it hasn't been created already) and add that display method to the CustTableListPage form in the Application Object Tree.
This is a development task, not a personalisation.