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I have a pyramidal cell and I want to create section that is called "distal_basal" for the distal part of all the basal dendrites (the distal 1/3 part of the dendrite, about 150um from the soma).
How can I do that?
I tried to write:

access soma
distance()
distal_basal = new SectionList()
forsec basal {
if(distance(0) > 100) {
distal_basal.append()
}
}

- but it takes entire dendrites which start 150um from the soma (and I have long dendrites which start at the soma and have a distal part..)

Do you have a suggestion for a different way?

The "best" answer to your question depends entirely on what you are really
trying to achieve--in other words, what is the conceptual model that you need
to test. Without that information, it's like trying to throw darts at an unseen
target while standing blindfolded in a dark room.