The position of the role in the roles tree compare to the parent/child element.<br>If <span style="font-weight: bold;">parallel</span> the new role will be put <span style="font-weight: bold;">in parallel to the children</span> roles of the chosen parent.<br>If <span style="font-weight: bold;">nested</span> the <span style="font-weight: bold;">current children</span> of the chosen parent will be put <span style="font-weight: bold;">as children of the new role</span>.<br>