utorrent-download files at one time

I wanted to download a series consisting of 24 files. I'm using utorrent. To see a sample I downloaded two files completely, skipping the rest. Now I want to download few other select files. So how can I include the files which i had skipped without a fresh start i.e I dont want to stop seeding the files which I had downloaded. Is there any way to do this in utorrent