We are trying to upgrade our subscription to Quick Book Advance, But am not able to find an option.

Thank you for your question, selvakumar. I understand you are looking to upgrade to QuickBooks Online Advanced.

As 4Gal mentioned, QBO Advanced is only offered in select countries like the US, UK, Canada, and Australia for now. This is why you are unable to see the option in your QBO account.

If you're looking for additional features, I recommend using a third-party app that can be integrated with QBO. This would allow you to get more functionality like inventory management, advanced reporting, or other features that are currently not in your account. 

Follow these steps on how to look for an app:

1. Go to the Apps menu and proceed to the Find apps tab. 
2. Click the drop-down list for Browse category and select a category.

In addition to the steps outlined, I wanted to provide a couple extra resources that can be helpful as you manage your QuickBooks Online subscription going forward:

• Update Billing, Payment, And Subscription Info In QuickBooks Online
• How To Understand Your Subscription Rates And Charges

Please feel free to post any follow-up questions here or start a new thread if you need additional assistance down the road, selvakumar. The Community is always available to make sure all your QuickBooks Online needs are taken care of.