Hi
Launch from the city that has the services to share. We'll call it City A
- Go to the Region View
- Click on the Service you wish to share, like Garbage
- Click on the city to sell service. We'll call it City B
- Click the + sign to add the service, like number of garbage trucks you want to share
Now click the "Load" button for City B (or if City B has a different mayor, have them follow these steps)
- Go to the Region View
- Click on the Service you wish to buy
- Click on City A
- Click the Garbage service
- Click the Buy button
Be aware that for all of the shared / sold resources (power, water, sewage) - the available resources are split between the claimed cities. For example purposes, let's pretend you have 3 cities in the region. City A has 1000 gals to share; City B and City C will each be able to buy 500 gals, regardless if either one needs it. City B will never be able to buy 600 gals, even if City C is not using any of the excess.
Hope this helps. Happy Building!