How to split Webform in multi menus/tabs? Is it possible to split my webform into several menus/tab?
Note: aim is not to obtain a multi step webform but a webform with several sections reachable easily by selecting a tab.
There's the Webform Navigation module which allows you to let users navigate back and forth between steps of a multi-step form via the progress bar. How you design these steps in the progress bar is up to you. If you want them look like tabs, style the steps to look like tabs. That's all.

The goal of this module is to provide the ability to navigate forward
and backward through a web form using the Webform Progress tracker
(aka wizard progress bar) supplied by the webform module on multi-page
web forms. It also allows for the ability to bypass validation when
the user presses the &quot;next&quot; button as they navigate through the form.

Alternatively use collapsible fieldsets to contain sections of your webform.