Moving sims from one neighbourhood to another

[Ellie]

(I tried searching but didn't find anything very useful.)

So is it bad to move sims with a lot from one neighbourhood to another?
And if it's bad, will it screw up both neighbourhoods or just the one the sims are moved to?

[Diala]

The more technical details can be explained by someone more awesome than I, but it is a VBT... unless you completely purge said Sim of all friendships, contacts, memories, family tree, and pretty much anything linking him/her to the neighborhood. It is so much effort, you might as well just use Sim Surgery on SimPE. (I haven't used it myself, but it is a common suggestion.)

EDIT: Here's a tutorial on how you can use SimPE to clone Sims. I gave it a quick test, and it seems to work well.

[Karen]

And if it's bad, will it screw up both neighbourhoods or just the one the sims are moved to?

Just the one the Sims are moved to.  But I agree with Diala, it's really a bad idea. 

[Gwill]

No it's bad for the neigbourhood as well.  You get a lot of dead and useless character files clogging the place.
Don't do it.

[C.S.]

Have you seen Too many files/sims explanation for dummies needed?