This required field determines whether you are adding (specify 'Add') or removing (specify 'Delete) one or more listings from the promotional sale identified by the PromotionalSaleID value in the request.
If you specify 'Delete', you must include one or more ItemID values under the PromotionalSaleItemIDArray container, and you cannot use the other filter options in the request. If you specify 'Add', you can add one or more listings using any of the filtering options in the request. Active auction listings that have one or more bids cannot be added to or removed from a promotional sale.
See the
Field Index to learn which calls use Action.