inclusion of fields in screen structures

Hi Gurus,

Right now I am working on standard BSP customization especially Business Partners, I have the requirement to include fields which are existing in other tables (ex: SMOKNA1)but are not present in screen strcutures (ex: CRMT_BSP_SEARES_ACCOUNT). How can I include those fields from other tables to the screen structures, after that what changes I have to do in Model access classes.

Any help is greatly appreciated.

Advanced Thanks to You guys,

Murthy