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When building for Sinfar, you will only need to use the Toolset to create and edit area. All other blueprints can be created and changed using Sinfar development website: https://nwn.sinfar.net.
Changes are live and can even sometime instantly be seen in game. At worst you will have to reload the area or re-create the object in game.
Sinfar worlds are not made of big module but of plenty of resources (blueprints / ResRef) classified into ERFs and the websites allows you to mange those ERFs and their resources.