How to add people to watchlist automatically

[ursnani]

I have a   field on Catalog Item "other_interested_parties"( Referring User Table and its a List Collector). When the user adds users to that field and submit the request then the people in that field should be added automatically to watchlist. I know we can do this after Business Rule (Insert).

Can any one please provide with code which helps me alot.

Thanks

[ursnani]

HI Sanjeev,

I have many Catalog Items with the same field which has to inherit the same property, So do i have to add all my Catalog item in the condition or is there any way i can achieve this.