I have a use-case where I have several opportunities divided by 2 recordtypes. At the moment all show up in the related list on account. I have created 2 extra lookup fields from opportunity to account for the 2 opportunity recordtypes. I want to hide the standard related list of opportunity on account an use the 2 other related lists to separate the recordtypes so that related list A on account has opportunity recordtype A and related list B has opportunity recordtype B. How do I assign the different recordtypes to the different related lists with Procesbuilder. 1. Do I start from Opportunity or from Account as an object 2. How do i get to select the related list in the Proces builder? Thanks.
Opportunity is the record you want to trigger on. The criteria will be the record types, and the actions will be to set the appropriate lookup fields. You're not targeting a "related list", but simply the object that you wish to change. Since the change occurs on the opportunity, that's the object you need to use.