With Custom Roads, you can add and modify attributes and restrictions to the network. However, you should be aware of the following:
--You should be knowledgeable about how to use the ArcGIS Pro Network Extension and have a good understanding of how a network works.
--Modifying the network is possible, but it is not documented. Tech support may not be able to help if you run into problems. You may make the network inoperable.
--You are responsible for making any updates to the network when a new version of Custom Roads is released.