Can you use a psn card in one purchase and keep the rest of money for future purchases?

Yes, you can use a portion of the funds on a PSN card for one purchase and keep the remaining balance for future purchases. When you add a PSN card to your PSN account, the full amount of the card is added to your wallet. You can then use the funds from your wallet to make purchases in the PlayStation Store, including games, add-ons, and subscriptions.

If the purchase amount exceeds the remaining balance in your wallet, you will be prompted to select another payment method, such as a credit card or PayPal. Any unused funds on the PSN card will remain in your wallet and can be used for future purchases.