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This will explain how to define the invert elevation for multiple conduits coming into one manhole, since the manhole only has one invert field.
The inverts of conduits are set in the properties of your conduits
Double click on the first upstream conduit to open the properties of it.
Look for the property called "Set invert to Stop?" and set it to 'False'. Confirm that the stop node is correctly set to the downstream node in question.
Once you do this you have the option to set the 'Invert(Stop)' field to the value you would like.
Repeat steps 1-3 for the other incoming conduits.