If you search the forum here there should be many examples to help. This is one way to read the properties and values of a property set from a given set of objects:
Above are all out-of-the-box nodes except the select objects is from the Civil3DToolkit. There are many other nodes but this is likely the first step in getting data ready for an excel export. If you have a specific script you want help with post a screenshot or .dny file.