parent-module-->child-submodule1
             ->child-submodule2

<profiles>
  <profile>
    <activation>
      <property>
        <name>doit</name>
        <value>true</value>
      </property>
    </activation>
    ...
  </profile>
</profiles>

<profiles>
  <profile>
    <activation>
      <file>
        <exists>src/main/xcopy</exists>
      </file>
    </activation>
    ...
  </profile>
</profiles>