how to update multiple datas

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SQL-Server-2008R2

hello i am inserting multiple rows and updating row multiple times on same moment using stored procedure and type.

USE [SMB]
GO
/****** Object:  StoredProcedure [dbo].[AddS_Sell]    Script Date: 10/18/2015 01:04:22 ******/
SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO
ALTER   PROCEDURE [dbo].[AddS_Sell]

@date datetime,
@Total decimal(18,2),
@Add_Sell [dbo].[AddS_Sell] READONLY
AS

BEGIN

declare @ScopeIdentity uniqueidentifier; 
 set @ScopeIdentity= NEWID();
 
	  SET NOCOUNT ON;
	  begin try
	  begin transaction
insert into [SMB].[dbo].[S_SellMaster]([Id],[Date],[Total])values(@ScopeIdentity,@date,@Total);
insert into [SMB].[dbo].[S_SellDetails] ([Party],[Quality],[Quantity],[Rate],[Labour],[Net],[Sid])select 
[Party],[Quality],[Quantity],[Rate],[Labour],[NetAmt],@ScopeIdentity
from @Add_Sell;

update  b set b.[Stock]= b.[Stock]-c.[Quantity] from   @Add_Sell  as c inner join [SMB].[dbo].[S_Quality] as b  on b.Id=c.[Quality]
where b.[Id]=@ScopeIdentity;
update  b set b.[Stock]=b.[Stock]-c.[Quantity] from   @Add_Sell  as c inner join [SMB].[dbo].[S_Quality] as b 
  on c.[Quality]=b.[Id] ;
	  
      commit transaction
		end try
		BEGIN CATCH
		rollback transaction;
		declare @ErrorMessage nvarchar(max), @ErrorSeverity 
int, @ErrorState int;

    select @ErrorMessage = ERROR_MESSAGE() + ' Line ' + cast

(ERROR_LINE() as nvarchar(5)), @ErrorSeverity = ERROR_SEVERITY(), 

@ErrorState = ERROR_STATE();

    raiserror (@ErrorMessage, @ErrorSeverity, @ErrorState);

		END CATCH

END

multiple insertion is working properly. but while updating multiple rows only first rows data is updated in another table.