A very comlicated dynamic form

Hi guys,
I am pretty new to JSF and I have to get a dynamic form working. Here you can see a mockup of the form, which has to be created. Blocks of drop down filed should be added and removed dynamically by clicking on the "+" and "-" buttons.
My first idea was to make templates for the different blocks as follows:
<ui:composition xmlns="http://www.w3.org/1999/xhtml"
      xmlns:ui="http://java.sun.com/jsf/facelets"
      xmlns:s="http://jboss.com/products/seam/taglib"
      xmlns:h="http://java.sun.com/jsf/html"
      xmlns:f="http://java.sun.com/jsf/core"
      xmlns:a4j="http://richfaces.org/a4j"
      xmlns:rich="http://richfaces.org/rich">
                                   <h:panelGroup>
                                        or<br />Can
                                        <h:selectOneMenu styleClass="components">
                                             <s:selectItems value=""     noSelectionLabel="Select Subject" />
                                        </h:selectOneMenu> execute
                                        <h:selectOneMenu styleClass="components">
                                             <s:selectItems value="" noSelectionLabel="Select Operation" />
                                        </h:selectOneMenu> on
                                        <h:selectOneMenu styleClass="components">
                                             <s:selectItems value="" noSelectionLabel="Select Object" />
                                        </h:selectOneMenu>
                                   </h:panelGroup>
                                   <h:panelGroup>
                                   <h:commandButton value="+" styleClass="components"/> <h:commandButton value="-" styleClass="components"/>
                                   </h:panelGroup>
                                   <h:div name="mydiv"/>
</ui:composition>and then update these divs with the templated blocks. Unfortunately I dont know if that would be the right way to go. I would appreciate it if you could steer me in the right direction with some code examples and ideas.
MANY THANKS!

Thank you for the reply. So on the back I will have something like an arraylist of row objects and the + and - would remove objects from the list? Am I getting it right? Do you by any chance know any tutorial or an example to which i refer?
Thanks!

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