Hi Mariusz. Unfortunately, ODB++ is strictly an output from PADS. Import is not supported.
Any reason? Or maybe is it planned in the future?
It's a bit hard when you need to import design from your customer into PADS if the only one way to do it is manual schematic redraw.
ODB++ is really a manufacturing data set and is not suited to Schematic data exchange. What is the original format of data do you have it in? Mentor does have schematic, layout, and library converter that maybe better suited to what you need to do.