HI @P_B 

A: In this documentation you have detailed information about the Execution order of scripts and engines:

https://docs.servicenow.com/bundle/tokyo-application-development/page/script/general-scripting/refer...

1. ‘On Before’ business rules with an order lower than 1000
2. Workflows (by default, not deferred)
3. ‘On Before’ business rules with an order greater or equal than 1000
4. The data base operation (insert, update, delete).
5. ‘On After’ business rules with an order lower than 1000
6. Workflow engine (for deferred workflows), Trigger engine (for all Flow Designer flows) etc
7. Email Notifications
8. On After business rules (Only active records). Scripts configured to execute after the database operation with an order greater than or equal to 1000.