PRICAT: Using PRICAT_K010 for managing extension? (Pricecatalogue)

Hi,

We have a requirement where IDOC: PRICECATALOGUE02 must be extended to host additional fields of MARA.

I read that we can use segment E1BPPAREX and table PRICAT_K010 for managing extension.

Also, reference to BADI WRF_PRICAT_IN_CUST is mentioned to process this data.

Does anyone has some example or more details on how to use the above mentioned segment, table and BADI for managing additional fields of IDOC  PRICECATALOGUE02?

Thanks,

Arpit