Yes, premium users can customize the order of any draft to account for traded picks. To account for traded picks, navigate to your My Leagues page and select the appropriate league from the list. Delete any Draft Assistants you have open and click on "Edit" under the "Draft Details" option. You’ll be able to alter the order of your draft board to re-assign any picks that have been traded.
If you're using the Draft Assistant w/ Sync for your real draft and haven't had time to customize your Draft Details, then don't worry. Once your real draft starts and you launch the Draft Assistant w/ Sync, the Assistant will automatically detect any traded picks prior to the beginning of the draft. Please note that picks that are traded during your draft will not be synced in the Draft Assistant.