Hello. How can i repeat the same conditions and actions in for example… 10 different scenes? should i have to copy and paste everything? or there is a simpler way? Thank you for your time.
Check the “External events” and the “Link” special event, which links to a given external event 
(You can link to the same external event from multiple scenes to do what you’re asking).
There’s more info on the wiki: http://wiki.compilgames.net/doku.php/gdevelop5/events/link
Thank you soo much . Have a great day !