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Any part refunds / part returns is between you and the seller to be sorted out in the dispute part of the claim.
Once escalated the ONLY option you get with paypal is return of everything you received back to the seller for a full refund, they don't get involved in part returns or part refunds.
In the event of a dispute you choose your seller and not Paypal so you need to bear in mind possible return trackable costs before you go ahead and buy from that seller / country.
Paypal state this >>
IMPORTANT: You may be required to return the item to the seller or other party we specify as part of the settlement of your claim. PayPal Buyer Protection does not entitle you to reimbursement for the return shipping costs that you may incur.
Although they will compensate you for some of the cost if you have activated this at some point before you made that transaction.
You also have the option to do a chargeback via your card issuer instead of a Paypal dispute if you funded your Paypal payment via a credit card.
If the seller is in the same country as you then maybe consider the small claims court if you have that option in your country?