If you are looking to build a folder or subfolders of poses quickly bypassing the normal Library process of individually creating them, the solution is simple.  As a matter of information, each entry into the Favorites Tab is basically a content shortcut and a copy of the .png icon.  To duplicate this externally, locate the Collections folder within the P11 Content Runtime.  This is normally within the Libraries folder.  Enter the Collections folder and generate whatever folders/subfolders you need to assemble your files.  Locate each file that you want to place into the Collections folder and create a shortcut to that file.  Place the shortcuts in the Collections folder then return to the original folder and generate a duplicate of the .png icon for each pose and place those in the same location as your content.  Depending on how many files you need to transfer, the process can become a bit tedious.  But it should save you the headache of using Poser exclusively to populate the Favorites Tab.  BTW, what I just describes is based on the PC, but it should work the same on a MAC.