TreeExtract

TreeExtract[tree,pos] extracts the subtree of tree at the position specified by pos.

TreeExtract[tree,{pos1,pos2,...}] extracts a list of subtrees of tree.

TreeExtract[tree,pos,h] extracts subtrees of tree, applying h to each subtree.

TreeExtract[pos] represents an operator form of TreeExtract that can be applied to a tree.

Examples

tree = Tree[a, {Tree[b, {c, d}], Tree[e, {f}]}];
TreeExtract[tree, {1}]

Please visit the official Wolfram Language Reference for more details.