Hi
If I understand you correctly, a Bar rollup is all sub tasks rolled up into the Summary Task, this will then give you the earliest start and latest finish for all sub tasks contained in the Summary Task.
Milestone Tasks are simply indicators in a plan that advise when a certain point or task(s) are completed with a plan, there is not really such a process as Milestone Bar rollup.
Hope this helps.
Tony(OTPM)
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