Transact SQL :: How To Update ParentID And RowOrder

I have this question is the extension of my previous question.I have a table,

DECLARE @TBL TABLE (RowNum INT, DataId int, RowOrder DECIMAL(18,2) NULL, ParentId INT NULL)
INSERT INTO @TBL VALUES
(1, 105508, 1.00, NULL),
(2, 105717, NULL, NULL),
(3, 105718, NULL, NULL),
(4, 105509, 2.00, NULL),
(5, 105510, 3.00, NULL),
(6, 105514, NULL, NULL),
(7, 105513, 4.00, NULL),
(8, 105719, NULL, NULL),
(9, 105718, NULL, NULL),
(10, 105718, NULL, NULL)
SELECT * FROM @TBL
 
Initially I asked question related to update "RowOrder", now I need to update "ParentId" also. example : if master has RowOrder 1.00 and there are 2 child's before 2.00 (another master) , then child entites RowOrder will be 1.01 & 1.02 & ParentId for both should be = 105508 and so on...

I got below query to update "RowOrder" from another thread,;

with tmp(Original_RowNum, Original_DataId, Original_RowOrder,New_RowOrder) as
(
select RowNum, DataId, RowOrder,cast(RowOrder as DECIMAL(18,2)) from @TBL where ROWNum = 1
union all
select t.RowNum, t.DataId, t.RowOrder,case when t.RowOrder is null then cast(tmp.New_RowOrder + 0.01 as DECIMAL(18,2)) else cast(t.RowOrder as DECIMAL(18,2)) end from @TBL t inner join tmp on tmp.Original_RowNum + 1 = t.RowNum
)
select * from tmp

how to update "ParentId" for table @TBL.