T-SQL to Update Table Dynamically

Hi Experts,

I n step #2 In the following SP,  I tried to update the table called @AsIsTable but I keep getting this error:

Msg 1087, Level 16, State 1, Procedure sp_ImportingNewDump_1.0_Conslidated, Line 37 [Batch Start Line 0]
Must declare the table variable "@AsIsTable".

So how to fix that step?

CREATE PROCEDURE [dbo].[sp_ImportingNewDump_1.0_Conslidated]
	-- Add the parameters for the stored procedure here
	  @DumpDate nvarchar(255) = NULL
-----------------------------------------------------------------------------------------------------
AS
BEGIN
	-- SET NOCOUNT ON added to prevent extra result sets from
	-- interfering with SELECT statements.
	DECLARE @AsIsTable varchar(MAX);
	DECLARE @CreateAsIsTableSQL varchar(MAX);
	DECLARE @VersionNumber nvarchar(255);
	DECLARE @VersionDate nvarchar(255);
	DECLARE @DataSourceName nvarchar(255);
	DECLARE @ImportingDate nvarchar(255);

	SET NOCOUNT ON;
BEGIN TRAN
BEGIN TRY  
 -----------------------------------------------------------------------------------------------------
 -- 1. Create AsIs Table
	SET @AsIsTable = N'tb_Test_Services_ImportedByWizard_AsIs_'+@DumpDate+''
	 IF EXISTS (SELECT * FROM INFORMATION_SCHEMA.TABLES WHERE TABLE_NAME = @AsIsTable)
       PRINT 'Table '  + @AsIsTable + ' already exist'
    ELSE 
		SET @CreateAsIsTableSQL = 'CREATE TABLE ' + @AsIsTable + ' (
		[AgencyName] [nvarchar](255) NULL,
		[ImportingDate] [nvarchar](255) NULL,
		[VersionNumber] [nvarchar](50) NULL,
		[VersionDate] [nvarchar](255) NULL,
		[DataSourceName] [nvarchar](255) NULL,
		) ON [PRIMARY]';

Execute (@CreateAsIsTableSQL);
-----------------------------------------------------------------------------------------------------
  -- 2. Update AsIs Table
UPDATE @AsIsTable
    SET 
	   VersionNumber = @VersionNumber
      ,VersionDate = @VersionDate
      ,DataSourceName = @DataSourceName
	  ,ImportingDate = @ImportingDate

-----------------------------------------------------------------------------------------------------
END TRY

BEGIN CATCH  
    SELECT   
        ERROR_NUMBER() AS ErrorNumber  
        ,ERROR_SEVERITY() AS ErrorSeverity  
        ,ERROR_STATE() AS ErrorState  
        ,ERROR_PROCEDURE() AS ErrorProcedure  
        ,ERROR_LINE() AS ErrorLine  
        ,ERROR_MESSAGE() AS ErrorMessage;  
  
    IF @@TRANCOUNT > 0  
        ROLLBACK TRANSACTION;  
END CATCH;  

IF @@TRANCOUNT > 0  
    COMMIT TRANSACTION;  
-----------------------------------------------------------------------------------------------------
END

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Thanks a lot in advance.
Harreni