To filter or for quick reaching them, we can assign them to categories.
To manage theme, just go to Product Base > Categories
Similar the product base items, we have the filter and bulks action on this screen. You can reach to items easily by sort by and pagination.
Bulk Actions : You can also remove multiple items at once. Select the items you want to act on using the checkboxes, then select the action you want to take from the Bulk Actions menu and click Action.
Add/Edit Category
To add the new item, just click on button Add New Category. You got screen bellow after that: