I it possible to make one dialog with multiple dropdown menu and multiple text field using Script Editor (and not Xcode) ?
I know Xcode it's probably the best option but some of the script in my current script won't work with xcode.
You may want to take a look at Dialog Toolkit. It is a scripting addition which can be used in Script Editor:
Dialog Toolkit and Dialog Toolkit Plus are ASObjC-based script libraries for showing enhanced dialogs. Add multiple text entry fields, checkboxes, popup menus, radio buttons, path controls, extra buttons and rules to dialogs. Dialog Toolkit v2.0.3 is a compatible update that fixes an issue with macOS High Sierra (10.13), while Dialog Toolkit Plus is an enhanced version that gives greater flexibility but requires macOS 10.10 or later. You can download the libraries and documentation here.