To convert a FeedItem into a SitelinksFromFeed object, we need to
retrieve the FeedMapping for the feed, and then map each attribute into the corresponding object properties. Please check out
GetFeedMapping function line# 271 which is called at line # 203 in the
MigrateToExtensionSettings C# example code from the client library. Other languages example code could be found
here.
Umesh, AdWords API Team.