In Salesforce, it is not possible to directly create a many-to-many relationship between two records of the same object type (e.g., Account to Account). However, you can use a junction object to achieve a similar effect. A junction object serves as a bridge between two objects and allows you to establish many-to-many relationships. Here's how you can accomplish this:
Create a custom object to serve as the junction object between the Account records. Let's call it "Account Junction" for this example. This object will have two master-detail relationships, one to Account A and another to Account B/C. Additionally, you may want to add any other relevant fields to the junction object if needed.
Hope this helps!
Enroll for the salesforce admin certification here!