Yahoo! Japan refers to this feature as a QuickLink.
Sitelinks appear just under your ads, and reference a specific page on your site. They provide a better experience for your users—instead of having to slowly navigate through your site to find what they’re looking for, users can jump straight there using a single click.
You can create and edit sitelinks in Search Ads 360 either by using the UI, or through a bulksheet. Alternatively, you can create sitelinks in Yahoo! Japan and edit them through Search Ads 360.
Copying campaigns with Yahoo! Japan sitelinks
You can copy campaigns containing Yahoo! Japan sitelinks, into other engine accounts that support sitelinks.