With the WebOffice 10.7 SP1 Net trace tool the functionality of net tracing will be provided. Therefor the availability of an (Esri) geometric network is a precondition.
Geometric networks offer a way to model common networks and infrastructures found in the real world. Water distribution, electrical lines, gas pipelines, telephone services, and water flow in a stream are all examples of resource flows that can be modeled and analyzed using a geometric network.
See also: http://desktop.arcgis.com/en/desktop/latest/tools/data-management-toolbox/an-overview-of-the-geometric-network-toolset.htm
In the following image you can see an example for an ESRI geometric network, consisting of different point- and line feature classes (inside a feature dataset):

Esri geometric network
To use the Net trace functionality in a WebOffice 10.7 SP1 project, the tool Net trace has to be configured as mentioned below.

Tool nettrace
Property |
Description |
Use Tool? |
Control if this tool is available in the WebOffice 10.7 SP1 Client or not. |
Properties nettrace
Note: See chapter Nettrace for more details about the tool in the WebOffice core client.