Any table created in Civil 3d should be able to be easily exported to EXCEL or CSV or maybe even converted into a regular Autocad Table…
There are a few alternatives for now. The best one I have found is the “Table Exporter” App. Available for free from the Autodesk App EXchange.
Download “Table Exporter” here
Once installed it provides a tool in the ribbon the dumps your table straight into excel! Great App!
Another alternative is you can use the COT.lsp, link below.
Basically explode the table twice, use the COT.lsp to convert it to an Autocad Table, then right click-> export…
Download COT.lsp (convert to table)