How would u guys go about propagating/pollinating rohededendrons

Heya, weird one but I am up doing my dad’s garden and he would really like a type of rhododendrons which his friends have, however I can’t find them anywhere.But we have been offered to take a cutting if I can get one or two more for them as-well.

Iv propagated before but don’t kno where to start with rohdes so figured I’d ask Reddit coz it seems like a good place to start.