I don't have a direct solution for you. I was personally trying to force a certain tree to be used. Of note, the leaves option below will create a tree with set number of terminal nodes, not sure that may help you or others. Also, a weird way to force a split in,  may be to just split your data into two sets and fit two trees. But I am sure that probably won't address what you are trying to do.     prune costcomplexity (leaves=10);   ... View more