How to show different payout timeframes on distribution

How do I show a 50 year period but a 20 year Pay Down so that Distribution 1’s income is still based on Interest Only and Distribution 2’s income could for example, use a death benefit to improve cash flow and spend Interest and Principal but only for 20 years.  If I show a 50 year measurement of money the second person doesn’t run out at age 84, but I want to illustrate 50 years for both examples, but Distribution 2 running out in 20 yrs. 

Make the Illustration Period (Years) be 20 first.  Note you can also put 65 in place of 1 in the Year column so it shows 65-84 instead of 1-20.

Then turn off the automatic Pay Down calculation (click on the “PayDn” button on Distribution 2 so it is no longer blue).  Then change Illustration Period (Years) to 50 which will stretch out the illustration to 50 years and you will see that the Pay Down amount does not change so it runs out of money in the 20th year.