It may be that you already know which categories you do/don't want to advertise with on the export channel. You can exclude these products in the Categories step.
Caution: By deactivating the categories, it will deactivate the selected categories and exclude the items that are matched by these categories.
- Go to the Categories step of the channel where the categories are set.
- Click on the Manual Categorization tab.
- Locate the specific category that you want to exclude and select its checkbox.
- At More actions, click the + icon dropdown. Select option Deactivate selected.
- In the statistics, you can view how many products have been excluded by deactivating this category.
Tip: There are also other possibilities to exclude products, for example rules.