There are a number of ways to do this. If you already know the shape of the regions, you can draw a selected set around each area. Create a zone for each area. Then open the pipe flex table on each selection set (View Flex Tables Open on Selection) and the globally set all the pipes in that table to a given zone. Repeat for each zone. Alternatively, you can use pressure zone manager to identify pressure zones and use Export Pressure Zones to get a list of pressure zones. You can then assign say Pressure zones 1,2 and 3 to Zone A etc.
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