Promotions offered across each of the aggregators offer a discount on either select menu items and all items on the menu.
This field shown in Grid Builder and also in the Promotions Analysis impact the score for the promotion.
If the promotion is on all items it will have a much higher promotional score vs promoting select items.
Examples of "Select" and "All" promotions.
Takealytics automatically classifies each item for select and all promotional types. This can be seen in the "Select/All" field in Grid Builder.