drainage tools toolbar, click the 
Manhole Network Properties button. Then select the drainage network that you want to see the manhole properties for.
The Manhole Properties Schedule window shows an editable list of settings for all the manholes in the selected network.
On the drainage tools toolbar, click the Manhole Network Properties button. Then select the drainage network that you want to see the manhole properties for.
After picking a drainage network you will see the following window appear:
Additional information may be shown here if relevant. For example, when importing a drainage network, if there are differences in the imported network compared to the current information this may be brought to your attention in this information box.
In the list area you can click on the cells to modify the properties of any manhole in the selected network.
Clicking on an cell containing editable text or an editable value will show a textbox that can be type into in order to change the property. When a textbox is shown, pressing enter will save the modified property.
For example, to change the invert level of a manhole, click on the invert level in the table, type in a new level, then press enter to apply the change.
Multiple rows of the list can be selected by first clicking on one of the manholes, this may bring up a text edit but this can be ignored. After selecting a manhole you can then hold shift and click on another manhole to select all the rows between and including the selected manholes:
Alternatively, you can select an initial manhole and then hold control (Ctrl) to add another manhole to the selection one at a time. This way the selection does not have to be sequential.
With multiple rows selected you can then click on one of the properties of a selected row to change it for all the selected manholes.
For example, this will allow you to change the Sewers Specification used to determine the automatic type, for multiple manholes all at once.