It is possible to upload any items up to the website that are not listed on Amazon.com as long as you have a non-Amazon Payment method enabled such as paypal or Mals.

You will need to create an upload file that is either TAB delimited or comma delimited. 

There are 3 required fields and several recommended fields.

The required fields are:  sku, price, and quantity

The recommended fields are:  author, title, book condition,  notes

If you include ISBN or ASIN then the website will pull book information from Amazon including image and category.

If you don't include ISBN ( or if Amazon does not have a category) you should include the field category

quantity should be 0 when you no longer own the item.

category should be in the format:  MainCat:SubCat1:SubCat2   ( for example  Books:Childrens Books:Educational

The file should contain the column names in the 1st line with the data following.  An example of a tab-delimited file would be:

sku, price,quantity, author,title,book condition,notes category

123,12.99,1, Jackie Vivelo, Beagle In Trouble, Very Good, Bumped Edges, Books:Childrens Books

You can upload and process your file from the main page of the website control panel using the 'Upload & Process Inventory Files'