I just tie my plant on the side to expose the growth shoots to the light.
Then just keep tying the growth shoots down trying the maximize the number of growth tips that recieve light.
It doesn't happen overnight...it takes a while before the growth tips become big like the main growth tip.
You must also be very gentle. It is very easy to snap a stem if your not careful or stoned.

The method has worked successfully for me.

These are all pictures of one plant.
first and last pics are of my current grow, the others are from my last.