Hi,
You have to do customization to achieve this in Odoo.
We dont know how much you can understand this. Since you are  an account manager.
There is a 'state' field in sale.order object.

You have to override that field and add your state in to. in the below example you can see a new state called 'waiting' is added.

This isn't enough, Now you have only added the value to the list of states. You have to add related changes in tho the UI.

You can see how we added the approve button to the sales form view in below example. same way you can add your own button.

Then You have to add a new method to change the current state to your new state when you click the button.

You have to do at least this much to get a new state in Sale order/Quotation. Same has to be done with Purchase Order.

If you need this state to be included in filters and other areas, there are still many things to do.