Inkscape doesn't have native multple page support (yet). There's an extension which uses PDF to keep multiple pages together. But unfortunately, it's only one page at a time for Inkscape, at this time.
Well, actually I'm not sure what an artboard is. But it sounds like different canvases. You could probably keep each "artboard" image as a layer in Inkscape, and just unhide whichever one you need at the moment. But it still means opening one at a time to copy it to a new layer.
Multiple page support is a llooong standing, and much requested feature. I'm not sure if it's specifically part of the Roadmap, but I think it ought to be.
This is not kept up to date, and maybe overly optimistic. But at least you can see what's on developers' minds.
http://wiki.inkscape.org/wiki/index.php/RoadmapSorry, I wish I had a better answer for this.
