How to transfer (clone) a section from one site to another on modx revo?

Question

MODX

Actually the essence is stated in a question. There are two sites - combat and test copy. If small features are made, then there are no problems when transferring from test to battle, everything is done by hand. But what about when a new structure is made on the test (sections, subsections, subsections near subsections, about 300 new documents in total)? How to carry it? Are there any applications (extensions)?
MODX Revolution 2.6.5