Activity link with fixed end

Hello my question is: I would like the 20058-PRODUCTION activity to have a fixed time from 20/04 to 10/05, and it is 15 days.
Then I would like to tie the 20058-CAD activity which could last 1 day.
I would like to be able to connect the two activities, if I were to delay 20058-cad and lasted 2 days, I would like 20058-PRODUCTION to last 14 days and the end date of 10 / did not change, but therefore began on 21/04.
I apologize in advance for my English, I am attaching an example not configured for this question.esempio gd.gan (3,1 KB)