Automation to duplicate subitem to another board but keep in original board

Hi - I have a board I use to track a payment schedule for certain items (the payment schedule is contained in the subitems).

I have a separate board that is used for any and all requests that come through to me from people in my organisation.

I am hoping to find a way to send a sub-item to the Request board when a due date is approaching without completely removing it from the original board.

I have been able to send the item to the request board but it removes the item completely from the original board. I still need the items there and I just cannot figure out if it can be done or not.

Any assistance is appreciated - I am hoping it is an automation I can create rather than using a 3rd party or paid app.