How to add a data entry ( parameter ) for users ?

Hello, is it possible to insert a parameter (data entry) that the user will input values in it.

I have the "prevision" table which contains the "codeart" and "objectif" columns, and I want to add a parameter that allows the user to insert values of "objectif" based on the "codeart". For example, for "codeart" 45, the user can enter the value 3000, and for "codeart" 38, the user can enter the value 6000. 

The "codeart" column is already instantiated. The "objectif" column is initially null, and the user will input the forecast for each instance of "codeart".

Thank you