You import Schwab trades into a trading journal by either auto-syncing through Schwab's API on supported journals or by exporting a transactions CSV from Scwhab web portal and uploading it. Historical TD Ameritrade trade history is now obtained from Schwab, so set your import filter to Charles Schwab.
Log into Schwab, navigate to History, select your date range, and download the CSV. Major journals (RizeTrade, TraderSync, Tradervue, TradeZella, Trademetria) support Schwab imports and map fills automatically across stocks, options, and futures.