I see that you just bought Big Oven. I have Big Oven too and I also have the Cook'n Software. It is my understanding that you need the software to import the different cookbooks and once you have those in Cook'n you have the ability to use the 'import wizard' to get them into Big Oven.
I have Big Oven on 2 laptops, did a test on one laptop first using the 'import wizard' to convert all the dvo files into the Big Oven format.
I made a RBox folder in BigOven 1st called Cookn and then imported to it. The only drawback with this is you can't just import specific cookbooks, which sucks!! So, after the complete DVO file imported I ended up with 17,000+ recipes from ALL the different cookbook in ONE file!!! What a mess ~~ spent a lot of time removing tons and tons of duplicate recipes that were previously in different cookbook titles in Cook'n. It would be much better if there was a way to just import one specific Cook'n title (i.e. Cook'n with Pillsbury) etc. and not have to do a mass move.
So needless to say I didn't import Cook'n into my other laptop for this reason. It will be faster for me and more time saving to just type in the ones I want from printed out copies or just looking at the other laptop while typing.
If you are still confused let me know and I will try and explain it better.. good luck!
Hope this helps!!!