<https://forums.geocaching.com/GC/index.php?/topic/272463-can-you-bulk-add-to-bookmark-list/#comment-4687689>
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"No easy way. In fact, the most efficient way to do it is still very tedious. Create a new bookmark list, run a PQ on the shared list and import it into GSAK. Find, install and run the Bookmark macro. It will bring the first cache page up in the add to bookmark screen. You need to select the bookmark list you want, add the cache to it and then hit continue, where the second cache will come up, etc. \n"
<https://forums.geocaching.com/GC/index.php?/topic/272463-can-you-bulk-add-to-bookmark-list/>