You can use condition "Boolean condition with math, date-time or text-string terms" provided by JIRA Workflow Toolbox using the following configuration:
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Boolean expression is:
count(subtasks()) > 0
Not out of the box. The statuses available on the workflow button are always dependent on the transitions available for your issue's current status.
Alternatively you can use ScriptRunner to make a condition for your transition which checks for the presence/absence of subtasks.
A builtin script is here which shows how to check all subtasks are complete before allowing a transition to take place.
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