To Customize Properties in the TakeoffPropertyMap Node
Make a back-up copy of the property map file you wish to customize. This is likely to be the file: C:\Program Files\Autodesk\Navisworks Manage 2015\Quantification\TakeoffPropertyMap.xml, or an Autodesk Navisworks 2014 or 2015 xml property map of your choice. This means you can revert to the original file if necessary.
Open your model in Navisworks.
Click Home tab Select and Search panel Find Items .
In the left navigation pane, click your model (as opposed to individual objects).
In the Category column, select Element from the drop-down list.
In the Property column, select Unconnected Height from the drop-down list.
In the Condition column, select Defined from the drop-down list.
Click Export and save the xml file locally.
Right-click the xml file Open with Notepad or similar text editor. The xml file will look something like this:
In your xml file, copy the lines of code that correspond to the condition node highlighted in yellow above.
Open the property map file here: C:\Program Files\Autodesk\Navisworks Manage 2015\Quantification\takeoff_maps\TakeoffPropertyMap.xml (or use a file map template of your choice). Paste your copied text into the property map file (find and replace the existing condition node if it is visible in the file).
In the property map file, locate the code: <TakeoffPropertyMap Name="Height Map">, change the text Height Map to any other name you wish to use.
In the property map file, locate the code: <TakeoffPropertyName>ModelHeight</TakeoffPropertyName>, change the takeoff property ModelHeight to the takeoff property that you wish to use.
Save the xml file in the file path: C:\Program Files\Autodesk\Navisworks Manage 2015\Quantification\... If you close and reopen Quantification in Navisworks, your customized properties will be picked up automatically.