Relative Animation Presets
If you're trying to make multiple bubbles rise up, you'd probably be better off designing a single bubble, then using it as a particle, inside a particle engine (AE has free particle engines like "CC particle systems" built in, but it's tricky to use).  Trapcode Particular is quicker and easier, but not free.

e.g. 
http://people.redgiantsoftware.com/explore/presetdetail.aspx?presetid=831