Creating a new issue inside a different project

Hi all,

Rather new to all this. I'm looking for someway to create a new task inside a different project when a task is set to a certain state.

Example of this...

(Project - TSK) "TSK-XX" - When the state of this changes from "X/Y/Z" to "testing", create a new task inside another project (Project - TEST) "TST-XX".

Is this possible? If so, could anyone give me an insight please? Tried looking for hours.

Thanks!