When you choose Copy From this will copy the event excluding the link to the resource you copied it from. This allows you to copy an event from Person A and paste it into Person B on a new date. The new pasted event will now be linked to Person B not Person A. Only the link to Person A is removed.
When you choose Copy With this will copy the event exactly. If you copy an event shown in Person A, and paste into Person B on a new date, the new event will be linked to both Person A and Person B.
Last updated on Jan 19, 2018