Close a task and automatically open other task

Close a task and automatically open other task

Hi, I'm new to Zoho Projects.  I've read all docs and have done a lot of tests, but can't make it work.

The goal is pretty simple:  If a user closes a specific task, automatically other specific task has to be opened  (without user interaction)

How can I achieve this?

Example: I have these tasks (all closed by default) :
-a
-b
-c
-d
User open task "a", later the same user closes his task "a" and automatically task "c" is opened


THANKS!
Raúl