Creating Table Using Dynamic SQL

I have the following dataset using dynamic SQL which works when i execute it, when i try to create a table using this dataset i cant see any fields. Does anyone know why dynamic SQL doesnt work ?

Declare @TopRange int
Declare @BottomRange int
Declare @SQL Varchar(1000)
IF @Param_leadage = '91+'
SET @TopRange = 91
ELSE
Set @TopRange = RTRIM(LEFT(REPLACE(@Param_leadage,'-',''),2))

IF @Param_leadage = '91+'
SET @BottomRange = 4000
ELSE
Set @BottomRange = LTRIM(RIGHT(REPLACE(@Param_leadage,'-',''),2))

SET @SQL = 'SELECT dbo.tblCustomer.idStatus, dbo.tblCustomer.idCustomer, dbo.tblCustomer.DateSigned' +
' FROM dbo.tblCustomer' +
' WHERE DateDiff(day, dbo.tblCustomer.DateSigned, GetDate()) >= ' + convert(varchar,@TopRange) + ' AND DateDiff(day,dbo.tblCustomer.DateSigned, GetDate()) <= ' + convert(varchar,@BottomRange)
IF @Param_status = 'Online Churn'
SET @SQL = @SQL + ' AND dbo.tblCustomer.idStatus = 4 or dbo.tblCustomer.idStatus = 5 or dbo.tblCustomer.idStatus = 11'
ELSE
SET @SQL = @SQL + ' AND dbo.tblCustomer.idStatus = ' + @Param_idstatus

EXEC(@SQL)