Hi @JeanPierre_LeGuillou, welcome back to the Asana Forums! Did you try and click the Customize button in the top right corner? It should look like this 
When you click that button a new drop-down window will appear where you can create rules and it looks like this
Hopefully this will fix your problem of no longer being able to find the Rules builder in Asana. As for you issue with the rules not carrying over to a new project from your template, it looks like a user had a similar issue previously and they had to reach out to Asana support to get it resolved following these steps.
@Marie do you know if there is another resolution to this issue?