With other apps, yes. Without apps, I don't think so. Are you open to using third-party apps?
Cheers
Yes, don't include sub-taks issue types in your Issue Type Scheme that your project is using.
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Why you questions states you don't want to create sub-tasks?
Sub-tasks can only be based on a parent, then can't be created without a parent, but if you want to limit this on specific parents, then no this is not possible without an 3rd party app like script runner
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