1. Export the fills
Tradovate: Orders, and Performance if you have it. NinjaTrader 8: the Executions grid. Rithmic: R|Trader Order History, filled or completed rows. TopstepX: the trades CSV, or the optional read-only key. Sierra Chart: Trade Activity, rows whose type is Fill. Interactive Brokers: a Flex futures query. Each integration page has the steps.
2. Put fees in before you trust the net
If the file has a commission column, that number wins. If it does not, choose the fee preset on the account. The preview shows skipped rows. Nothing is stored until you confirm, and a confirmed batch can be undone.
3. Tie the session
Import the statement or the performance file on Reconcile. A tied day matches to the cent. An open day names the gap: missing fee, partial fill, or no statement at all. Write the note on the trade after you can see the fills in order.