Dear Bimal,
Greetings from India.
You can bid or buy from Kathmundu only on items having international worldwide shipping. You have to register with PAISAPAY in ebay.in and make the payment through a Debit/Credit card.
You can ask the seller if he accepts other mode of payment too. If the listing does not have any international shipping you can ask the seller to revise it to include international shipping.
If you want any other assistance you can give a missed call on +919333788294 and I will give you a call. View my eBay profile at http://myworld.ebay.com/hlasker
REGARDS.