How to change the value of distributed weighted constrained random generation

In reply to rupeshblr:

if want to deliver randomize test code to test vector team (who does not know the sv) who can change the value of w1,w2,w3 i.e trying to create the control knob or control file to achieve the above scenario (ms excel file to just feed the value of w1,w2 and w3) ?

In short i need the control knob or top level control file where i can just feed the value of w1, w2, and w3 ?

kindly suggest me if anything is possible to achieve the above scenario?