How to Update the Purchase Order with another Cart data

Hi all,

I have a case to update purchase order data with payment details, orders status and cart data.

I'm able to update status of purchase and payment but i'm unable to update cart. That means I would like to change replace the cart data wth new cart.

And One more doubt is , can we extend OrderStatus and PaymentStatus meta classes?

Please help me is there any way to do the same?

Thank you!