Add a button labeled  'Create New Document' (this will reside on the Xpage considered the 'parent')

using simple actions do the following:
    Save the current document
    Store Note ID in a scoped variable:      sessionScope.put("parentNoteID",currentDocument.getNoteID());
    Open Page (to create the 'new' document): select name of page to open, set target document to New Document (in this case the 'childDoc')

In After Page Load Event:

    if(currentDocument.isNewNote()) {
                  var parentDoc=database.getDocumentByID(sessionScope.parentNoteID);
                  var childDoc=currentDocument;
                  fInherit(parentDoc, childDoc);                      // I store inherit function in a javascript library, sample code shown below
                   }


function fInherit(parentDoc, childDoc){
getComponent("Form").setValue("Exception_Form");   
var itemname = "Account_Bank";   
    getComponent(itemname).setValue(parentDoc.getItemValue(itemname));   
var itemname = "Bank_Abbrev";   
    getComponent(itemname).setValue(parentDoc.getItemValue(itemname));
var itemname = "Bank_Name";   
    getComponent(itemname).setValue(parentDoc.getItemValue(itemname));
var itemname = "Account_Branch";   
    getComponent(itemname).setValue(parentDoc.getItemValue(itemname));
}