Editing grade of non-PSA inventoried items

Ewornek

I know you can enter a grade when entering a non-PSA card into inventory, but, if you forgot to enter a grade, can you edit the inventory item later to add the grade? I can't see how to do that. Sorry for the "newbiness" of this question, but I wanted to avoid deleting and re-entering the item (not because of the minor effort involved, but because I did not want to move the active item to a sold status).