Replace/change layers and its purpose in a bounding box

Hello Everyone...

I want to change all the layers of one type (i.e.- M1) in a bounding box (a defined area in layout with its coordinates) to other one (i.e.- M2) and also change the purpose of it (i.e.- drw to pin). How to do it? What are the functions defined for this task?

Regards,

gaurc