You can add instrument level commission rates that override global commission settings. You may set up a global commission rate for trading futures of $4.00 per side however you may have a reduced rate for trading the DOW Mini futures contract of $3.00 per side in which case you need to add this rate the DOW Mini contract in the Instrument Manager.

1. Open up the Instrument Editor window for the instrument you wish to add a commission rate for.
2. Expand the Commission parameter for your connectivity provider.

3. Click the "..." button to open the Collection Editor - Commission Item window
4. Press the "New" button and you will see a commission item object added in the window like below.

5. Enter a commission rate value and unit limit that the rate is affective for.

Example: If we had a commission rate of $3.00 per side for an unlimited number of contracts, the set up would look like the image below.

6. Press the "OK" button.