Add different options to table output

I have a table for calculating the price(subtotal, total).
When you click on the “add data” button, a new field appears in which you can select an option. But this option is the same.
How do I separate these options so that I can choose different ones?

My code:

I changed your current selected variant from a String value to Array:
selected: []
And also <select v-model="selected[index]"> on template.

You can check this example:

I think you should update your total and totalKM computed variants when apply new change.
Good luck. :smiley:

thank you so much!!