want to change my iTunes account from US Store to Store and i want to reset My balance

You’ll either need to spend it or if it’s not enough to purchase a product or service, you’ll need to contact Apple Support to have your account set to zero. If you’re in the US please call 1-800-MY-APPLE or outside the US, consult the support article below.

Contact Apple for support and service - Apple Support

Change your Apple ID country or region - Apple Support

Hello ~If you are trying to zero your balance before changing regions…you may purchase an item from the App Store for more than your balance and the remainder will be billed to your credit card on file thus zeroing your balance . You may also go to lower left hand corner and click on Support and they can zero it for you or…

Contact Apple for support and service

Also if you are changing regions take a look through this article as well…

Change your Apple ID country or region - Apple Support

~Katana-San~