WINRAR archive split into two folders

[boy2man]

I'm trying to extract a large program and WinRAR has say, Disc 3 in two different folders. Parts 1-7 are in one, (the 7th part has an arrow indiciating it's incomplete) and parts 7-24 or whatever are in another folder (the rest of part 7 is in this second folder, also with an arrow). I've tried to extract them to the same location but then it just leaves out the 7th part altogether, and it won't let me manually extract just the 7th part to the folder with all the other parts. Any help is greatly appreciated, thanks.