Invoice numbering

You can set the starting number, which will be used from your next invoice created with Dexxter, under: Settings - Sales invoice - Numbers ...

What JM says is indeed a way to continue working with the same numbering as Dexxter, but if the Excel numbering is other, this does not really offer a solution.Normally, when uploading an external invoice, you can select the invoice number yourself. This can even differ from the Dexxter numbering and use a total other code.