Partial close MT4 button

I need a button to be displayed in the mt4 screen.

When I press this button, it should partially close my opened orders.

For example, I just opened a buy order with 10 lots. When this order is in profit ( or even in loss ) , when I press the button, it should partially close my order , and just leave 10% of the original order open. So it must close 9 lots and still leave 1 lot open,

This  (% ) should be configurable. So, I must be able to choose how much percent it should partially close.

Thanks