This is a quick way to share multiple checklists all at once. Copy and paste a list of subIDs that you want to share, one per line or separated by blanks, and click "Share". You'll get back a list of URLs that you can copy and paste in a single email to everyone with whom you are sharing. They can click on the URLs one by one in order to share the checklists.
The "subID" is the "Snnnnnnnn" part of the checklist URL. You can also paste the entire URL.