Copying and pasting a rendered clip should work without a re-render if it’s a standalone clip. If you place it over another clip, then you’ll have to render. You can try exporting the rendered clip as a QT with current settings, and then Import it to use. However, if you’re placing that clip over another clip, you’ll probably have to re-render.
John
MacPro 8-core 2.8GHz 8 GB RAM OS 10.5.5 QT7.5.5 Kona 3 Dual Cinema 23 ATI Radeon HD 3870, 24″ TV-Logic Monitor, ATTO ExpressSAS R380 RAID Adapter, PDE enclosure with 8-drive 6TB RAID 5
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