Help answering this interview question

Hi,

I was posed an financial analyst interview question today that I’m hoping to get some insight into how to answer IF this is the wrong forum to post this I apologize.

If a company has a division that has 3 product lines established at the begining of the year, and mid year they are contemplating adding a 4th line what steps would need to be taken.

Also, another hypothetical is to see if the 4th line could replace line 2 of production. Again what steps?

I answered to the best of my ability but I would love some others insight into this.

Thanks!