Make a object visible only inside one box or Group

Is it possible to make an object visible only inside the group block and if it is lying half in Group and other half Outside the block then only Block half should be visible.

Sorry, but no, at the current time there is no way for one Part to define a clipping region for other Parts.

Or are you asking about something else?

yes, something like that.

Can we exactly get the intersecting points of one such object intersecting with other object.
Intersection points of two objects.

var r = someNode.actualBounds.copy();
var intersection = r.intersectRect(someGroup.actualBounds);

If you want the bounds of some object within the visual tree of a node or group, call getDocumentBounds.