DataTable campo Editavel

[evandro_araujo]

Pessoal, gostaria de fazer o seguinte,

editar o campo qtd, porem este campo não faz parte da minha entidade, conforme a imagem , tentei fazer da forma abaixo, porem a qtd = 0

segue abaixo meu codigo e a imagem ,

        <h:form id="formindexlogin">  
    <p:dataTable var="car" value="#{carBean.cars}" selection="#{carBean.selectedCars}"
         rowKey="#{car.year}" >
             <p:column selectionMode="multiple"/>
             
        <p:column>  
            <f:facet name="header">  
                <h:outputText value="Qtd" />  
            </f:facet>  
             <p:inputText id="txtqtd1" value="#{carBean.qtd}"/>                              
        </p:column>      
             
             
        <p:column>  
            <f:facet name="header">  
                <h:outputText value="Year" />  
            </f:facet>  
            <h:outputText value="#{car.year}" />  
        </p:column>      
             
             
        <p:column>  
            <f:facet name="header">  
                <h:outputText value="model" />  
            </f:facet>  
            <h:outputText value="#{car.model}" />  
        </p:column>               
             
        <p:column>  
            <f:facet name="header">  
                <h:outputText value="Manu" />  
            </f:facet>  
            <h:outputText value="#{car.manufacturer}" />  
        </p:column>               
        <p:column>  
            <f:facet name="header">  
                <h:outputText value="color" />  
            </f:facet>  
            <h:outputText value="#{car.color}" />  
        </p:column>               

</p:dataTable>
    <p:inputText id="txtqtd" value="#{carBean.qtd}"/>                              
            
    <p:commandButton actionListener="#{carBean.itensselecionados}" value="Enviar" />
             </h:form>             


***********************************************

@ManagedBean
@ViewScoped
public class CarBean {
    

private List<Car> cars;
private Car selectedCar;
private Car[] selectedCars;

private int qtd; 


     public void itensselecionados() {  
        for (Car room : selectedCars) {   
            System.out.println(room.getYear());   
            System.out.println(room.getModel());   
            System.out.println("qtd"+getQtd()); 
        }  
          
    }