Check the below input & output data, and sort product data based on its versions information.

Input data:

ProductName ProductVersion
----------- --------------------
ABC         1.2.3
EEF         1.1.2.2
PQR         4.3
ABC         2.3
PQR         2.2.6.7
EEF         0.2.3.4
YRT         0.1.1
ABC         0.8.7.1
ABC         0.1.1.2
EEF         0.8.7.2
PQR         3.6.5.1
ABC         8.6.1.2
EEF         3.6.5.2
PQR         5.4.2.1

ProductName ProductVersion
----------- --------------------
ABC         0.1.1.2
ABC         0.8.7.1
ABC         1.2.3
ABC         2.3
ABC         8.6.1.2
EEF         0.2.3.4
EEF         0.8.7.2
EEF         1.1.2.2
EEF         3.6.5.2
PQR         2.2.6.7
PQR         3.6.5.1
PQR         4.3
PQR         5.4.2.1
YRT         0.1.1

CREATE TABLE tbl_ProductVersions 
(
	ProductName VARCHAR(10)
	,ProductVersion VARCHAR(20)
)
GO

INSERT INTO tbl_ProductVersions 
VALUES 
('ABC', '1.2.3'),('EEF','1.1.2.2')
,('PQR', '4.3'),('ABC','2.3')
,('PQR', '2.2.6.7'),('EEF','0.2.3.4')
,('YRT', '0.1.1'),('ABC','0.8.7.1')
,('ABC', '0.1.1.2'),('EEF','0.8.7.2')
,('PQR', '3.6.5.1'),('ABC','8.6.1.2')
,('EEF', '3.6.5.2'),('PQR','5.4.2.1')
GO

WITH CTE AS
(
	SELECT 
		ProductName
		,ProductVersion 
		,ROW_NUMBER() OVER (PARTITION BY ProductName ORDER BY CAST('/'+REPLACE(ProductVersion,'.','/')+'/' AS HIERARCHYID)) as Rno
	FROM tbl_ProductVersions
)
SELECT 
	ProductName
	,ProductVersion 
FROM CTE
ORDER BY ProductName,Rno

Before one week ago, we were preparing a few reports of database performance.
We are publishing a list of our servers in the descending order by showing most utilized servers at first and least utilized servers at last.

But on that day, our client requested to display a particular X server information at always top and then display other servers in descending orders.

Below is a very simple solution of this:

Create a table with sample data:

CREATE TABLE tbl_Classes
(
	ClassID INT PRIMARY KEY
	,ClassName VARCHAR(10)
)
GO

INSERT INTO tbl_Classes 
VALUES 
(1,'A'),(2,'B'),(3,'C')
,(4,'D'),(5,'E'),(6,'F')
,(7,'G'),(8,'H'),(9,'I')
GO

Select the sample data with simple ORDER BY DESC:

SELECT * 
FROM tbl_Classes 
ORDER BY ClassName DESC

ClassID     ClassName
----------- ----------
9           I
8           H
7           G
6           F
5           E
4           D
3           C
2           B
1           A

ORDER BY the data in decending order and keep Class=D in top:

SELECT * 
FROM tbl_Classes 
ORDER BY
CASE WHEN ClassName = 'D'
	THEN 1
    ELSE 2 
END ,ClassName DESC
GO

ClassID     ClassName
----------- ----------
4           D
9           I
8           H
7           G
6           F
5           E
3           C
2           B
1           A

ORDER BY the data in decending order and keep Class=D,E in top:

SELECT * 
FROM tbl_Classes 
ORDER BY
CASE WHEN ClassName IN ('D','E')
	THEN 1
    ELSE 2 
END ,ClassName DESC
GO

ClassID     ClassName
----------- ----------
5           E
4           D
9           I
8           H
7           G
6           F
3           C
2           B
1           A