I am connecting to MAC machine remote from windows laptop to develop an app. I am planning to add constraints in xcode and the documentation says, I need to do contrl-dragging as specified here.
I couldn't find any help online on how to do this. Could someone please help?
Your question is confusing because Control-dragging is done the same way on a Windows PC as it is done on a Mac.
Windows laptops should have a Control key (possibly label Ctrl). Press and hold down that key. While you're holding the Control key down, press and hold down the left mouse button. Move the mouse. You are now Control-dragging. When the mouse cursor reaches the desired destination, release the mouse button and the Control key.
If that doesn't work or help you understand, you're going to have to be clearer about the nature of your confusion or the problem.