c # – How to move an object clicked in the center of a 3D plan of Unity

basically I have a map made with airplanes (20×10 boxes) and what I want to realize, is that if I click on a box after pressing a character, it moves to the center of the box, regardless of where you click .
The only thing I realized is a similar mechanics to that of League of Legendswhere do you clique Your character moves, but I want to divide the card into squares as I explained at the beginning. For more than I am looking for I can not find anything, and it would be a great help if you could give me a solution.