QUESTION: I want to postpone retirements for 1 year from the valuation date. That is, for my 1/1/2001 valuation, I assume no one retires until at least 1/1/2002.

ANSWER: First create two retirement tables: one with rates that apply through 2001 and one with rates that apply on or after 1/1/2002. The first table has rates that are all zeroes except for rate(s) of 1 at the table’s highest age. (In order to have no 2001 decrements due to retirement, you can set the highest age to, for example, 110.) Then in Input | Valuation Assumptions | Decrements, choose the "<rates by calendar year>" option for your retirement decrement. Click the Ret. Rates button to specify the retirement rate table of (mostly) zeroes through 2001 and the other table starting in 2002.