uml - 2 actors, same parent use case but each one having his own child use case -

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i have parent use case child uses cases, example:

parent use case: "selling subscriptions"

child uses cases:

  • "self buy subscription"
  • "sell subscription else"
  • etc

my question is: correct have 2 different actors (customer , vendor) linked parent use case in top level use case diagram, each of them linked 1 child use case in more detailed use case diagram or there wrong ?

the 2 actors should linked primary parent use case.

then in detailed use case diagram can specific link secondary use cases.

(if doesn't answer question please provide diagram want do)


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