[scikit-learn] Adding layers to an existing decision tree

[Zawack, Kelson]

Is there a way/ what would I need to extend to be able to take an existing DecisionTreeRegressor or  DecisionTreeClassifier and add nodes on to it.  Note I don’t want to refit the whole tree as this would change the existing root-ward structure,  I want to add nodes onto the decision structure that already exists.

Thanks in advance for your help