CSA-1099-R lines 2,3,6,9, and 11

When attempting to use the Simplified Method, I do not see lines 2, 3, 6, 9, and 11 which show how I calculated the Box 2a Taxable Amount. The form from OPM says UNKNOWN in Box 2a. I can calculate the amount in Box 2a offline, but I don't see lines 2, 3, 6, 9, and 11 from IRS Pub 721, Worksheet A to justify the amount I put in Box 2a. How do I get these lines to appear? Thanks.