SELECT  1       AS TAG
,       NULL    AS PARENT
,       CST_ID  AS [ROW!1!CST_ID]
,       NULL    AS [CST_ID!2!]
,       NULL    AS [CST_NM!3!]
,       NULL    AS [CST_TYP!4!]
FROM MY_TBL

UNION ALL

SELECT  2 AS TAG
,       1 AS PARENT
,       CST_ID
,       CST_ID
,       CST_NM
,       CST_TYP 
FROM MY_TBL

UNION ALL

SELECT  3 AS TAG
,       1 AS PARENT
,       CST_ID
,       CST_ID
,       CST_NM
,       CST_TYP 
FROM MY_TBL

UNION ALL

SELECT  4 AS TAG
,       1 AS PARENT
,       CST_ID
,       CST_ID
,       CST_NM
,       CST_TYP 
FROM MY_TBL 
ORDER BY [ROW!1!CST_ID], [CST_ID!2!], [CST_NM!3!], [CST_TYP!4!]
FOR XML EXPLICIT