InfoPath Dev

I have the following xml file

<?xml version="1.0" encoding="utf-8"?>
<InterviewQuestions>
  <Competancy>
    <Description>Manual Labour</Description>
    <Question>
      <QDescription>Tell me about your cleaning abilities.</QDescription>
      <SubQuestion>
        <SQDescription>Can you use a mop?</SQDescription>
      </SubQuestion>
      <SubQuestion>
        <SQDescription>Can you use a scrubbing brush?</SQDescription>
      </SubQuestion>
      <SubQuestion>
        <SQDescription>What chemical would you use to clean a sink?</SQDescription>
      </SubQuestion>
    </Question>
  </Competancy>
  <Competancy>
    <Description>Santa Impersonations</Description>
    <Question>
      <QDescription>Tell me about what being a santa  means to you</QDescription>
      <SubQuestion>
        <SQDescription>Do you getonwith elves well?</SQDescription>
      </SubQuestion>
      <SubQuestion>
        <SQDescription>Can you use a scrubbing brush?</SQDescription>
      </SubQuestion>
      <SubQuestion>
        <SQDescription>How do you keep you sherry consumption under control?</SQDescription>
      </SubQuestion>
    </Question>
    <Question>
      <QDescription>How do you look after your reindeer?</QDescription>
      <SubQuestion>
        <SQDescription>Do you give them any mineral supplements?</SQDescription>
      </SubQuestion>
      <SubQuestion>
        <SQDescription>How often do you have to trim their hooves?</SQDescription>
      </SubQuestion>
      <SubQuestion>
        <SQDescription>Are you practicing any selective breeding to eliminate/increase red noses?</SQDescription>
      </SubQuestion>
    </Question>
  </Competancy>
</InterviewQuestions>

The idea is that the user picks 1 or more competancy from a list box i a repating section. I can populate the options from the xml file no problem.

However after the select a competancy, I want a corresponding repeating section to appear with the list of questions (in either a multi selection list box or a series of check boxes, then for each question that they select the sub questions should be displayed (read only)

I can easily get it so that selecting the competency, populating the questions list box, but I can't work out how to get the sub questions to show. I would just like them in a bulleted list as they will be automatically selected.

Can you add a bulleted list bound to the sub questions in your secondary data source and filter based on the values selected for Questions?

I wanted a bulleted list as the users don't actualy select the final sub questions, but I can't see how you can apply a filter to lists. I didnt manage to get a mult select working, but, I don't want the users to have to click options. The final option will later be displayed on a print out view.