• Sell Item - Select Type (Sets, Parts, Minifigures, etc.) and press Submit. Check the box marked Custom Item and select a category for your item. Enter a description for your item in the comments box.

• Mass Upload - Leave the ITEMID tag blank, enter a category ID under the CATEGORY tag, and enter a description of your item under the DESCRIPTION tag.

To change an existing item in your inventory to a custom item, go to My Inventory, locate the item in your inventory, and click the Edit More link by the item. On the next page, select the Custom Item option, remove the item number, and enter a description of your item in the description box.