How Add a field to sap standard Infoset?

Hi Guys,

This requirement is from MM functional.

And I am the abaper.

I have one requirement that I need to Add a field and I need to write the code to populate this.

the Infoset name is :MM_VENDORS_LIST  in this the query name is: MM_VN_LIST,

How to add a field to this standard Query?

Could any one guide me on this step by step..

Thanks in advance.

Regards,

Allen Kumar.