Currently Netro can only run one zone at a time, so different zones for the same time cannot be created. This limitation is due to the fact that the power adaptor can only provide 600mA max current which is only enough for running one valve (when master valve is used).
We will support running multiple zones at the same time in future.
We understand a lot of our users need the feature and currently we are working on to support it. I will talk to our R&D and ask them about the rate of progress to support this feature.
Thanks for your suggestion. However, the limitation is from both software and hardware. In the software, we design the program to run the zones each by each. For the hardware, if you force to run multiple valves, the fuse on the circuit will cut off to protect the power from over heating.