I use a series of monthly goals to help acknowledge our progress and set a medium-term horizon.

I find that each month I consider the previous month's goals and then have to go and make a new set of goals without being able to reference the previous one. Often I want to roll over, or carry over, a goal which we are still working on.

My goals are usually in the form of Tasks. It would make sense to me to add a Task selection option that lists (not-Done) tasks from a previous Goal (or all previous goals), rather than selecting from the list of all Tasks.