Hi Chris

This is possible by creating a Certification and selecting Use existing certification content under the Recertification path option.

The recertification period can be set to a year. When a user completes the courses for the original certification the course results are archived and course activities reset where applicable. The archived course completions are shown in Totara Reports such as Record of learning Course completion history. The re-certification process will keep on repeating each year.

For a full description of Certification options and setup see 

https://help.totaralearning.com/display/TL9/How+Certifications+Work

regards