Check or change learning assignment

Content

We have some Health and Safety training that needs to be done by the most senior person in each of our locations each year. So we have assigned it to those people as required learning with details including due date and when they need to redo it.

Two things have come back after doing this.

1. One person has asked for their second in charge to be included as well. So what I want to do is add them to the assignment but I can't seem to be able to do this, it seems like the only option is to start a new assignment. How do I add the extra person so they are in line with all the others. (This will happen a  bit because new leaders will be appointed).