SQL Server 2014

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CREATE TABLE [InvoiceInfo]( 
                           [Invoice]  INT, 
                           [Date]     DATE, 
                           [Basecard] VARCHAR(100), 
                           [Item]     VARCHAR(100),
                           [Quantity] FLOAT,
                           [Price]    FLOAT
                          )
INSERT [InvoiceInfo] VALUES 
(713938,'2020-11-09','C90001','Desktop',   6,   200),
(713938,'2020-11-09','C90001','Laptop' ,18.5,1572.5),
(713938,'2020-11-09','C90001','Desktop',   8,   200)
3 rows affected

SELECT [Invoice],
       [Date],
       [BaseCard],
       SUM(CASE WHEN [Item]='Desktop' THEN [Quantity] END) AS [Desktop],
       SUM(CASE WHEN [Item]='Laptop' THEN [Quantity] END) AS [Laptop],
       SUM([Price]*[Quantity]) AS [Subtotal],
       SUM(ROUND([Price]*[Quantity]*.16, 2)) AS [Taxes],
       SUM([Price]*[Quantity])+SUM(ROUND([Price]*[Quantity]*.16, 2)) AS [Total]
  FROM [InvoiceInfo] i
 GROUP BY [Invoice], [Date], [BaseCard] 


Invoice
Date
BaseCard
Desktop
Laptop
Subtotal
Taxes
Total


713938
2020-11-09
C90001
14
18.5
31891.25
5102.6
36993.85


Warning: Null value is eliminated by an aggregate or other SET operation.


DECLARE @cols AS NVARCHAR(MAX),  @query AS NVARCHAR(MAX);
                        
SELECT @cols = 
       STUFF((SELECT DISTINCT ',' + 
                     CONCAT('SUM(CASE WHEN [Item]=''',[Item],
                                  ''' THEN [Quantity] END) AS [',[Item],']') 
                  AS formulas
                FROM 
                (
                 SELECT DISTINCT [Item]
                   FROM [InvoiceInfo] f
                ) ff
            FOR XML PATH(''), TYPE
            ).value('.', 'NVARCHAR(MAX)') 
        ,1,1,'');
       
SET @query = CONCAT(
    N'SELECT [Invoice], [Date], [BaseCard],', @cols , 
    N'      ,SUM([Price]*[Quantity]) AS [Subtotal],
             SUM(ROUND([Price]*[Quantity]*.16, 2)) AS [Taxes],
             SUM([Price]*[Quantity])+SUM(ROUND([Price]*[Quantity]*.16, 2)) AS [Total]
        FROM [InvoiceInfo] i
       GROUP BY [Invoice], [Date], [BaseCard]');

EXEC sp_executesql @query; 


Invoice
Date
BaseCard
Desktop
Laptop
Subtotal
Taxes
Total


713938
2020-11-09
C90001
14
18.5
31891.25
5102.6
36993.85


Warning: Null value is eliminated by an aggregate or other SET operation.