You misunderstand the form/system. When you are filling out a form you are filling out ONE form, identified by a tiny number in the top, left corner next to the word ACTIVE. Your currently active form...
From ANSC Form 7029, Section 3 – Non-Reimbursed Expenses: “Please list the total number of unreimbursed miles that you drove and the amount of any unreimbursed expenses required for all of your report...