How to turnoff the constraint that is present in another file .?

UVM
,
2

In reply to aalpa23:

Do you really need to make this random?

How about

class c_cfg extends uvm_object;
  bit c_bit = 0;
...
class a_cfg extends b_cfg;
function new(string name);
  super.new(name);
  c_cfg.c_bit = 1;
...