SAP PI Mapping with Header and Line items

Hello,

I have a requirement as below.

I need to map header data short description , and all line items short description into a single target field. Please help me if this is possible using which standard functions or do I need to write a UDF.

Example :

Source is  - >Header Short Descrition : Header text

                     Line Item 1                      : Line 1 text

                     Line Item 2                      : Line 2 text

Target Field : Header text  Line 1 text Line 2 text

The PI version is 7.31.

Thank You,

Zameera.