With the stamp tool you are able to copy custom objects, water, splines, splates, heights ect. in a selected part of a map. You can paste ("stamp") this selection into the same or in a different map as much as you like to.
Edit:
You can find it at the maintoolbar in worldbuilder under "Stamp Placement", 3rd icon right from "Water Placement".
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#Steam AliasWL%Streak
- 1.278110.716+16
- 2.270144.652+2
- 3.29446.865-1
- 4.558230.708+2
- 5.253150.628+14
- 6.968566.631-4
- 7.22491.711+11
- 8.8120.802-1
- 9.19078.709+4
- 10.399200.666+8