I do the same as Bee does...I just swap reels from my open water rods to the ice rods and carry on.
If I'm going for something finnicky like trout or perch I may tie on a few feet of fluoro for a leader but that's about it.
10lb PowerPro has something like a 2lb test diameter...I don't see the need to go any smaller than that, and if I get surprised on my light gear by a big ol' pike or something I've got a little more of a fighting chance
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Jay: Mostly harmless... 
Time, it makes you old. Experience makes you wise. It's only a fool who judges life by what he sees in other peoples' eyes.
- Strung Out
I may not have gone where I intended to go, but I think I have ended up where I needed to be.
- Douglas Adams