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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.
It stands for “Encapsulated Resources File” but we just call them ERFs. They are containers of blueprints that are using the same prefix(es).
They are represented that way on the website:
They can contain any number of resources of the following types:
Their main purpose is to split resources into meaningful entities, for example: an island, a scripting system, a set of generic items…
Splitting resources into multiple ERFs is a good way to document what you are building but it also lets you use many of the erfs_features on more specific resources.
Each ERFs has the following possibilities: