Adobe LiveCycle: possible JavaScript code?

[#1]

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. 

[JackAceHenry · Accepted solution]

If I understand correctly, you want to prefill data in tables/fields based on an event like field initialize or value change?

[JackAceHenry · Accepted solution]

yes

[Mayank_Gandhi · Accepted solution]

That's very much possible. I will share a sample in some time.