Adding conditional formating depending on user input.

Hello All,

Firstly, thank you for helping me out.

My excel file starts by asking a user to input a set of values in a single column (from column 1-10).These values are then used in a table for calculations. If the user also adds values to column, lets say, 12. I want to add 3 rows to my existing table....I tried conditional Formatting but with no luck. This is what I have.('x' = user input)

unit_name user_data
A x
B x
C x
D x
.
.
M x

....Im having trouble drawing a table here...but hopefully you get the point...I want to add 3 rows because the user added an input for "M". Thank you for your time and effort.