Command.fs

module Command

open ServiceA
open ServiceB

let run params =
  // How do I refer to the ServiceConfig modules in here?

ServiceA.fs

namespace ServiceA

type ServiceConfig =
    { ApiKey: string
      Host: string
    }
    
    module ServiceConfig =
        let create apiKey host =
            { ApiKey = apiKey
              Host = host
            }
            
    module DoSomething =
        let makeRequest serviceConfig params =
            // Make a call to ServiceA

ServiceB.fs

namespace ServiceB

type ServiceConfig =
    { ClientId: string
      Secret: string
      Host: string
    }
    
    module ServiceConfig =
        let create clientId secret host =
            { ClientId = clientId
              Secret = secret
              Host = host
            }
            
    module DoSomethingElse =
        let makeRequest serviceConfig params =
            // Make a call to ServiceA