When do you start cutting back to spread out and grow more buds for outdoor and indoor?

A customer has a question and I hope we can get some opinions on it, thanks

When do you start cutting back to spread out and grow more buds for outdoor and indoor?

I do a heavy trim a week before I flip to 12hr light schedule. And i will get rid of all my 3 leaves and lollipop on the 2nd week of flower for indoor. Out side it really depends on the weather and how it grows i am more active and steakin and tying and trimming when the weather gets in the 70s
And do a minimal amount of trimming and lst until then

Anytime before flower starts.

When depends on the plant’s development.