Quick background before the questions.
We started off with Amazon about 4-5 years back and set everything as free postage (as we were doing the same on etsy and ebay and our website) times have moved on and the buisiness has grown and last year we topped the VAT threshold so have now started collecting for the government. As such the "freepost" offering is now becoming a financial burden as it means we chasrge more for the item and as such pay more VAT on it. We are looking to change our post to crl/48hr tracked for all items so the vat is claimable as opposed to bpl2 which we use for most items atm. and are looking to change how we work on all of the platforms by introducing some flat cost postage for different items.
What are peoples thoughts on the best way to go about this as we have roughly 1600 lines?
Looking at changing from freepost to charged postage which means we will need to adjust all our prices and include the postage on all the lines. Is there an easy way to do this on a flat file or am i looking at adjusting each one?