I have a table that repeats using the built in button of ADD, REMOVE, UP and DOWN. Inside a column of the table I have another table that consists of 4 rows. All are time Fields StartTime, TimeField2, EndTime, and total. I don't need anything to happen with Time Field2. What I would like to see is the total field calculate the total man hours it took to complete that particular job. In addition there is a Checkbox that locks every field in the repeating table except the add button. This is to be used a log book for a fire department and needs to stay and be un editable once inputted. I'm using the following script in the calculate event for the total field. It works great until I save the form and check to box to lock out all the fields. I then get 0:18 in the total field and if I try and add more tables I get a NaN:NaN in the first table and nothing in the rest.