Sorry, I’m losing it…
You have 4 levels, if you like
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Design the structure, in the content browser. All it has in it at the fields, and possibly the default values.
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You can put that structure in a blueprint. Because you can save the blueprint, you can edit that structure in that blueprint, and save it. But if you want to have lots of different values for the structures, there’s no point in having lots of different copies of the same blueprint.
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If you want lots of different default values for structures, then you can use data tables. It is also possible to use the save game from editor mode.
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If you want to be able to store information from structures that get information written to them at runtime, then you definitely need a save game.