I was asked to combine postage.  I’m not familiar with using Invoices.  So, some advice would be good.  I spotted some advice that said enter the new postage value but do not click on recalculate, and just click on send.  I followed these instructions.  Then I saw my copy of the invoice which seems to have gone wrong.  Where do you think I goofed.  Item price $2.97;  I ‘blotted’ out the original postage item and set the cost to $0.00;  I added a 3kg satchel $13.40;  I pressed on send.  No where while I was doing this did a total appear, but when I saw my copy in my email the Total showed up at $2.97 despite $13.40 being displayed on the  invoice.  Is it possible (one I find out how to fix this) to reissue the invoice.?