Satish,
Unfortunately, there is no way to copy a table. You're only option is to create another table and add the fields in exactly as they are in the original. Which table were you looking to do this with? Also note that once you sync your QuickBooks file, it will sync the data to the stock tables, so you won't be able to redirect the data to other tables.
Could you sync a copy of your company file? This would allow you to test out what you need to in Method and it wouldn't affect your actual QuickBooks file. Then, when you're ready, we can reset your account. A reset will wipe your account clean, as if you are starting fresh with a brand new account and you can then sync with your live QuickBooks file.
- Adam