Executing TSQL batch multiple times through dynamic sql - sql-server

Question

I'm using SQL SERVER 2017 (Developper Edition 64 Bit) on a Windows 10 Machine. I'm trying to execute in a dynamic sql a batch multiples times through GO and it won't work.
But the sql Statement will work if it is not execute dynamically. The goal is to do it dynamically and I still don't figure out what I am doing wrong.
Here is how the definition tables look like:
ParentTable
(
Id uniqueidentifier DEFAULT (newsequentialid()) not null,
Created datetime not null,
Creator uniqueidentifier not null,
Modifier uniqueidentifier null,
Modified datetime null
)
ChildTable
(
Id uniqueidentifier DEFAULT (newsequentialid()) not null,
ParentTable_Id not null,
Created datetime not null,
Creator uniqueidentifier not null,
Modifier uniqueidentifier null,
Modified datetime null
)
This is what I've tried so far:
create Procedure InsertIntoChildTable
AS
BEGIN
DECLARE #countDset int
DECLARE #todaysdate datetime
DECLARE #UserName uniqueidentifier
DECLARE #ParentTable_Id uniqueidentifier
DECLARE #insertIntoChildTable nvarchar(max)
DECLARE #ChildTableName nvarchar(35)
SET #ChildTableName = ChildTable
SET #countDset = 6
SET #todaysdate = GETDATE()
SET #UserName = 'e86aacf4-9887-e911-9724-4439c492b2a7'
BEGIN TRY
BEGIN TRANSACTION
SET #insertIntoChildTable = 'INSERT INTO ' + #ChildTableName + '
(ParentTable_Id, Created, Creator, Modified, Modifier)
VALUES ( (select max(Id) from ParentTable) , #todaysdate, #UserName ,
NULL, NULL) ' + ' GO ' + #countDset
EXECUTE sp_executesql #insertIntoChildTable,N'#ChildTableName
nvarchar(35), #todaysdate datetime, #UserName uniqueidentifier,
#countDset int', #ChildTableName = #ChildTableName, #todaysdate =
#todaysdate, #UserName = #UserName, #countDset = #countDset
COMMIT TRANSACTION
END TRY
BEGIN CATCH
PRINT 'Could not insert in the Child table'
ROLLBACK TRANSACTION
RETURN
END CATCH
END
After the Line with 'Go ' + #countDset it will automatically go into the Catch block and return.
Thank you

Answer 1

INSERT INTO ChildTable ( ParentTable_Id, Created, Creator, Modified, Modifier )
SELECT (select max(Id) from ParentTable) as ParentId , #todaysdate, #UserName ,
NULL, NULL
FROM
(
SELECT TOP #countDset '' As Dummy
FROM sys.Objects As A
CROSS JOIN sys.Objects As B
) As Multiplier
Guided through the example Zohar posted I could insert new Rows in the ChildTable using CROSS JOIN