Thank you for your post and the suggestion.
We currently don't have any feature that allows the layers to be altered but we are looking at adding something like this sometime in the future. If you'd like a document that briefly explains the layers, can you please send an email to firstname.lastname@example.org
so I can send the document to you?
Also, if you use the 'Export Excel' and 'Export CSV' buttons on the Takeoff page you can export and manipulate the information into the formats that you've created and/or use.
Would you be able to please let me know if this works for you?