Please open distinct threads for distinct questions. It's not allowed, and it will help us to answer.
I don't understand your question about barcodes. If you want to insert a new inventory and assign it a barcode, it can be done using ATUM Export Pro. If you want to insert an inventory to a product using the product's barcode as the identifier, that is on our ATUM Export PRO TODO list, but I can't give you an ETA, sorry.
Please, edit your post, remove the additional question and add new threads for them.