Hi @Alasdair McKie
Indeed, parent tasks cannot be converted into Milestone, which results from the difference in duration of both elements.
By definition, milestones are represented on the Gantt chart as diamonds that do not have any duration, while parent task is a sum of the duration of its children.
A good practice and recommended workaround is using an additional Jira issue (milestone) or a Basic Task to mark a specific point along a project timeline and link it with a given parent task. If you want to avoid litter their Jira backlog with milestones, then we recommend using Basic Task.
Let me know if you have further questions.
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