Add template options selection when saving a new template from existing projects

Currently when you create a project from a template you can select the items that you want to include from the template :

 But when you create a new template from an existing project. You can only save the all project as a template without any option to select if you want to include “sub-project” “Milestones” “Tasks” “Files” etc…

An option that would allow you to select which items to include when saving a new template would be a great enhancement:

For future reference, the feature request ID is :CR-366862