combined postage
There needs to be a way that we can manipulate invoices to combine the postage when several different items are posted.
1
vote

Optionally, you can specify a reduced rate of postage for your items, for buyers who order two or more items from your shop. For more info see:
http://folksy.uservoice.com/knowledgebase/articles/57290-pricing-and-postage
Alternatively you can partially refund the buyer after they have paid via the transaction on your Paypal dashboard