It tells you in the manual how to do this. When you are in the select field screen, scroll down and select custom field, then when you are on that screen, press "D". This will then enable you to select each player by pressing keys 1-9 and as you select each player you can move them to where you want by using the arrow keys. When you are happy with your new field, press "Enter" twice and that's it! The only trouble with custom fields is, the field placings will stay as you selected them, but the actual players in those positions won't. For exanple, if you select your best slip fielder to field in the slips, the next time you go back to your custom field, he won't be in the slips, he will be fielding somewhere else, so don't bother trying to place fielders in their best positions. Hope this helps.