UA Vitae offers two methods to "copy" activities across reporting years. One is described here as the "continue" method, while the other, recently introduced, is the "clone" method.
When looking at your activities, some will clearly be ones that span calendar years. For example, you may be a member of a promotion and tenure committee for a three year period. This is a good use of the continue method. Rather than enter this activity for each of the three years, just enter the start and end of the committee membership: (starting) Spring 2013 and (ending) Winter 2015. This activity continues across the span of the three years, and will be included in reports that include any semester of this time span. For activities that may not have a set end, the end semester and year can be set as Present. An example could be membership on a doctoral candidate committee. An "ongoing" activity will continue to be included in reports until it is closed off with an end semester/year. During each reporting period, you will be asked to leave such an activity as ongoing, or to close it off.
Other activities may be short term, but repeat periodically. For example, you may annually attend a professional society conference. The activity would have very similar details each year, perhaps changing only the date and location. This would be a good use of the clone method. Rather than enter the activity each year, it can now be cloned from the previous year, then edited to update the details.