How can we hide only some of the inputs in a matrix field?

I want to give the user option to chose the column ''Relais 10.00$/chien'' only in the lines ''Relais 1 (ring 1) 10,00$/chien)'' and ''Relais 2 (ring 2) 10,00$/chien''. Cause for the paiement's calculation those lines haves to be 10,00$ instead of 15,00$. thanks for your help. 

If I understand you correctly, you would like to hide a radio button options in the matrix field. 

If yes, then please add this custom CSS code in your form.

#input_27_0_3, #input_27_1_3, #input_27_4_3, #input_27_5_3 {

display: none;

}

Here's a guide on how to inject custom CSS. Also, I used Google Chrome developer tools to get the IDs of these elements. Here's an example: 

Hope that helps. Thank you.

Thank you so much. Exactly what i was looking for!