Decoy set validation test in 3DQSAR pharmacophore modeling study

Dear Sir,
With due respect, I want a favor from your side. I am working on 3DQSAR pharmacophore modeling study by using 43 inhibitors. I have generated ten hypothesis with good correlation (q2) with the test set. I have used Discovery studio package for this purpose. I want to do decoy set validation test. How should I proceed and which particular protocol of DS2017R2 should I use?
I shall be grateful to you if you kindly give me some idea so that I can proceed my work.
With best regards
Ankur Chaudhuri
Research Scholar
West Bengal State University
Kolkata-700126
India