I have had a few questions about archiving in Coda tables. In the Rambling Pete's Archiving Examples doc I have shown three ways in which to do archiving.
The first, and simplest is simply to delete unwanted rows.
Another option is to have a button on a row that will first copy the row from the original table to the archive table, and subsequently delete the row from the original table.
Finally I give an example of using automation to automatically move and delete the rows.