Simple partial close button

Hello I moved fully from MT5 into Ctrader. I am newbie in Ctrader coding.

Now one thing i want to fix is: I need to write very simple tool which close position partially.(

There must be specific percent at input box then there must be one button. If I click this button

it close position partially with specific percent )

If anyone know this do not hesitate to help to me.

@PanagiotisCharalampous my friend pls help?

Thank you very much