TSQL MSSQL Split Column into Rows

Split_to_Fixed_Columns.sql

;with cte (ID, DeclarationItem, Declaration,SEQM) as
(
  select ID,
    cast(LEFT(CustomText01, 20) as varchar(20)) DeclarationItem,
         RIGHT(CustomText01,
			CASE
				WHEN LEN(CustomText01)-20 > 0 THEN LEN(CustomText01)-20
				ELSE 0
			END
		) Declaration,
	1
  from dbo.DocumentHeaders
  union all
  select ID,
    cast(left(Declaration, 20) as varchar(20)) DeclarationItem,
		RIGHT(Declaration,
		CASE 
			WHEN LEN(Declaration)-20 > 0 THEN LEN(Declaration)-20
			ELSE 0
		END
		) Declaration,
	SEQM+1
  from cte
  where Declaration > ''
)
select A.ID
 , SEQM
 , DeclarationItem
--, ROW_NUMBER() OVER (ORDER BY A.ID) AS ROW
-- , LEN(CustomText01) as TXTLEN
from cte A
-- WHERE A.ID IN ('5019','15876')
LEFT JOIN dbo.DocumentHeaders B
ON A.ID = B.ID
-- ORDER BY TXTLEN DESC,ID,SEQM
ORDER BY ID,SEQM