Creating an invoice for combined payments

Hello

A buyer wants to purchase 2 items from me and has asked to combine payments, we have agreed a price.I have set up combined payments. He has also asked for an invoice. As yet he has not made an offer or bought the items. 
Can you confirm that I can only send an invoice once items have been sold? I can send two items in one package.

Thanks.

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Yes,  buyer buys,  then waits for you to  issue that amended invoice with the combined postage cost. then he pays you.