llTargetOmega?

I've been using this to set two rotating objects within a linked set I've made. However, whenever I remove this linked set from my inventory, the parent/child states reset and I have to relink the objects...

Is there anyway to preserve states within inventory??

The short answer is, yes, but make sure your state_entry() events aren't set up to undo your work, make sure llResetScript() isn't in the wrong place, etc.

As long as you aren't, maybe accidentally, making the script reset its states will be preserved in inventory automatically.

I believe that the problem you are experiencing is not that the script's state is being reset, but that the rotation set up by llTargetOmega is not resumed when you rez the object. This is a known problem, and your question is a frequently asked question. There is no well-known simple work around.

See the wiki entry for llTargetOmega and one of the recent threads on this subject: Independent rotate script becomes ineffective when re-rezed