Extending Supplier Model by enabling Extensible Flexfields at Supplier Site Level

Summary:

Looking for a way to configure EFF on Supplier Site. Does any know if there is away or workaround?

Background: Client wants to flag an key data point that has multiple values for a given Supplier Site. An example would be like If I want to have multiple routes for a give supplier site-

Site: Sup-1

Routes(Custom Flag): A,B,C,D,E... etc. (this is something that a user will flag at the time of creating supplier site).

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