Although you can select Level Soffits in the Network Wizard, if you make a change in the manhole depth for example, the pipes in the network will return to invert level, which means that you will have to readjust them manually.
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Thank you for the suggestion and thanks to those who voted.
We will investigate and ensure that the pipes are set as per the design criteria (soffit to soffit) or (invert to invert). Would you please send your model which we can use to reproduce the issue described above to support@innovyze.com - thanks