EF CORE 3-field relationship with an entity

Question

Good morning! I am new to using EF Core so it may be that my question is simple to answer. I’ll tell you about the way my bank is. I have a process table, in it has 3 fields (Cia Aerea, Cia Maritima, Cia Rodoviaria) that are foreign key to the supplier table. How to make the Builder to map this 3 fields with this supplier entity?