Hi,
We have a Custom entity which has the list of people(Name, nick name & designation) who will be responsible for an opportunity. I am tring to create a place in opportunity where the opportunity owner or whoever has access to the opportunity can go and select the list of people who would be required from the Custom entity. The same people would also be added into another opportunity too. This seems like a N:N relationship but i am not sure where to start and how to achieve this. please help