Milestone appearances
Milestone appearances define the way which milestones are displayed in the bar chart. You can set up any number of milestone appearances and apply them to individual milestones - whether the milestones are tasks, resource allocations or cost allocations. Examples of different milestone appearances are: 
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You can specify default milestone appearances to apply to start milestones and finish milestones as they are created, and you can apply different milestone appearances to individual milestones once they have been created. You can also specify default milestone appearances for individual consumable resources, permanent resources and cost centres, to be applied to zero duration resource allocations and point spend cost allocations. You may want to apply a different milestone appearance to each resource or cost centre to help differentiate between their allocations.
You can edit the properties of a milestone appearance by editing options on the Milestone Appearance Properties dialog. To access help for the Milestone Appearance Properties dialog, press F1 while viewing the dialog.