Adobe LiveCycle: possible JavaScript code?

I wanted to know if there was a JavaScript code to complete the following actions:

1) I would like to automatically populate the first section by the number of cities and days when entered. I am having issues figuring out how to populate all (3) tables once the information is entered.

2) I've tried using the action builder and creating scripts to match table 1 Transportation cost and table 2 Transportation cost. It only does it once, but not if the cities repeat. 

Could someone help me with this? And I apologise for my vague descriptions.