{switch $pageCfg.detail_main.layout}

{case value="A"}
    {include file="module/detail_main/layout/layout_A" /}
{/case}

{case value="B"}
    {include file="module/detail_main/layout/layout_B" /}
{/case}

{case value="C"}
    {include file="module/detail_main/layout/layout_C" /}
{/case}

{/switch}