Unbounded Field inside unbounded field to be mapped to unbounded field

Hello all,

I’am having trouble with my map. 

The structure is Header/Detail(Unbounded) then inside the detail, there is an unbounded field. The destination schema is also Header/Detail but this time, the unbounded field inside the source schema is mapped to a node inside the detail schema of the destination and this is not an unbounded field. See below for reference

This is the SOURCE: Take note that the Extrinsic Node is Unbounded

Header: SampleHeader

Detail:

Extrinsic: Name:TagColor

Extrinsic: Name: TagText

Extrinsic: Name: TagType

Detail:

  Extrinsic: Name:TagColor

  Extrinsic: Name: TagText

  Extrinsic: Name: TagType

Detail:

  Extrinsic: Name:TagColor

  Extrinsic: Name: TagText

  Extrinsic: Name: TagType

This is the DESTINATION:

Detail:

TagColor

TagText

TagType

Detail:

TagColor

TagText

TagType

Detail:

TagColor

TagText

TagType

I tried using the string concat but to no avail. It just maps each record from the source and creates a new record for the destination. Any idea how can I succesfully map this?