Graphical mapping - Tree and subtree on Tree structure

Hi,

I have the following problem, the message source is a tree and subtree and the message destination is a tree and each with different field mapping. Functionally speaking, an order with positions of goods and services and service position with service sub-positions. The positions and sub​​-positions have different field mappings.

Example:

SOURCE TARGET

HEADER ----------> HEADER

POS 1 --------------> POS A

POS 2 --------------> POS B

SERV 1 ---------> POS C

SERV 2 ---------> POS D

POS 3 --------------> POS E

SERV 1 ---------> POS F

SERV 2 ---------> POS G

POS 4 --------------> POS H

Thank you to send me examples with graphical mapping.

Best regards,