Each city needs to build its own worker. If a city's worker gets captured, you can build another worker from that city to replace it. If you later recapture the worker, you have to merge one of the two workers back into the city right away.
Enslaved workers would have to follow the rules for captured workers in this situation. That is, you can sell them, disband them, or join cities with them. You may not use them to do any work. This applies even if the worker was "made" from one of your enslaved military units.
-Griselda
Enslaved workers would have to follow the rules for captured workers in this situation. That is, you can sell them, disband them, or join cities with them. You may not use them to do any work. This applies even if the worker was "made" from one of your enslaved military units.
-Griselda