How would I plan to take a year off of work to travel the world?

The best method is to use Events - Job change. Enter one Job change for the year you will not have a salary and enter -100% for the change in salary. Then for the following year enter another Job Change and add 100% for the change in salary. This will effectively stop salary from one year and then resume the salary for the remainder of the model. You can always delete Events, so it is good to see the result and remove it if you like.