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
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- 2.555227.710+11
- 3.29446.865-1
- 4.275110.714+13
- 5.259143.644+3
- 6.250150.625+11
- 7.22491.711+11
- 8.19265.747+5
- 9.672425.613+1
- 10.5611.836+3