API | create item from another item with subitem values and files

Hi, I hope I can make this clear. I am looking for some guidance or would like to know if it is even possible. I think the main part I am focused on is the file columns.

I have an Item in board A that when clicking a button I would like to trigger a webhook and send certain values from the Item and certain values from the subitem. There would be two file type columns in the subitem one of which would hold 2-3 files. I am hoping to send all the files to a new Item to board B.

Is there a special way I have to add these files to the board B considering the files are already on Monday.com?