Either:
- Schedule API Workflow on a list so it executes a workflow per item. (Easy difficulty, can’t get the resulting list of newly created Things though, low efficiency on large lists)
- Setup a recursive workflow to loop through the list and create an item for each. (Medium difficulty, Can get the resulting list, medium efficiency on large lists)
- Data API Bulk Create endpoint (Expert difficulty, can get the resulting list, high efficiency on large lists)
Or the easiest and best option that doesn’t exist yet: