I think he wants it to only be buildable in water. There is a similar thread with the answer already about how you make boats. Long answer short use regions and triggers.
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Contribute to the wiki (Wiki button at top of page) Considered easy altering of the unit textures?
today i tought of something.Units,structeres ETC........ cant be built/move in the water.Anything
Wait, what?
It works fine, they just can't be placed over the lowest cliff level, water doesn't interfere with anything.
I think he wants it to only be buildable in water. There is a similar thread with the answer already about how you make boats. Long answer short use regions and triggers.
Contribute to the wiki (Wiki button at top of page) Considered easy altering of the unit textures?
https://www.sc2mapster.com/forums/resources/tutorials/179654-data-actor-events-message-texture-select-by-id
https://media.forgecdn.net/attachments/187/40/Screenshot2011-04-17_09_16_21.jpg