I would move them manually - there tends to be issues involving that move option.
To do so:
- open up edit town
- click on your household and find the Save to Library button - click on it
- They will now be saved to your library
- Open up the world you want via the main menu
- Move in household and you can find them in the selection library
You will (like any normal move to another neighbourhood) lose all open opportunities and relationships with sims outside your town.
