Paste as Task
BusyCal supports pasting text as a list of tasks
Creating Tasks from text
Simply copy a plain-text list and use the Paste as Task
option from the Edit menu. Each line of text will be converted into a separate task.
To assign a date to the task(s), first select a day on the calendar and click Edit Menu > Paste as Task. When no date is selected, pasted task(s) will remain undated.