As frank stated you can set global defaults so that future series links are limited to the channel you set them up on etc.
Also notice link+ will show on demand shows if it is set up for that too.
You can also modify your current series link so that it is limited to the channel of your choice and only records new episodes etc.
Personally I always set it to any channel as that lessens the chance that you'll miss a recording because it has clashed with other recordings (unlikely with 6 tuners but still possible). It also makes it more likely it will find the 1st episode of a series I happened to miss the start of a series.
Basically just go and look at all the Link + settings and modify to your needs.
Basically just go in and modifie the link + settings