Ajax Framework Partial Process

<div class="card">
    <h:form>
        <h:panelGrid id="grid" cellpadding="7" columns="2" styleClass="mb-3">
            <p:outputLabel for="firstname" value="Firstname:"/>
            <p:inputText id="firstname" value="#{processView.firstname}"/>

            <p:outputLabel for="middle" value="Middle:"/>
            <p:inputText id="middle" value="#{processView.middlename}"/>

            <p:outputLabel for="surname" value="Surname:"/>
            <p:inputText id="surname" value="#{processView.lastname}" required="true"
                         requiredMessage="Surname is required"/>
        </h:panelGrid>

        <p:commandButton value="All" id="btnAll" process="@all" update="grid msgs" action="#{processView.save}" styleClass="mr-2"/>
        <p:commandButton value="Form" id="btnForm" process="@form" update="grid msgs" action="#{processView.save}" styleClass="mr-2"/>
        <p:commandButton value="This" id="btnThis" process="@this" update="grid msgs" action="#{processView.save}" styleClass="mr-2" resetValues="true" />
        <p:commandButton value="None" id="btnNone" process="@none" update="grid msgs" action="#{processView.save}" styleClass="mr-2" resetValues="true" />
        <p:commandButton value="Parent" id="btnParent" process="@parent" update="grid msgs" action="#{processView.save}" styleClass="mr-2"/>
        <p:commandButton value="This Surname" id="btnSurname" process="@this,surname" update="grid msgs" action="#{processView.save}"/>

        <p:messages id="msgs"/>
    </h:form>
</div>