I had no intention to say what Milky had said was wrong.
What we have to tell the questioner as a grammar rule is :
The 'WH-word' cannot be the subject of 'to V' in infinitival phrases in the form of 'WH-word to V'. .
So which norms to be used is wrong because which norms is the subject of to be used.
"You can decide which norms are to be used" is OK because here which norms is the subject of are, not of to be used.
paco