How do i transfer money from apple id account to apple cash?

Is not possible.

You can use your Apple Account balance to buy apps, games, music, iCloud+, and more, see -> Add money to your Apple ID balance -> Add money to your Apple Account balance - Apple Support (IN)

You want to zero your Apple ID balance?, see -> Check your Apple ID balance -> Check your Apple ID balance – Apple Support (UK)

• If your balance is less than the cost of a single item, contact Apple Support.
• scroll to ⤵️

If you have Apple ID balance you can't use.

You can't redeem or return Apple Gift Cards, App Store & iTunes Gift Cards or unused Apple ID balance for cash, except as required by law. If your jurisdiction allows the refund of redeemed gift balances, you can contact Apple Support to request a refund. 

When you contact Apple, include the following information:

•               Your Apple ID.

•               The refund amount.

•               Your current delivery address.