Create Multiple items based on the value in a column

I would like a change in status to trigger multiple item creation onto another board (or sub items would work) based on the value in the trigger item.

In context I am scheduling an installation jobs. When my installations manager has evaluated the job spec he enters the ‘man days’ into the job and changes the status to ‘ready to schedule’. With this status change as the trigger I then want to create ‘man days’ number of tasks with that job reference that can then be scheduled out to the installation team on a day by day basis.
Quite new to Monday, but would appreciate any help or pointers?