One of the best things about OpenSimulator is its ability to import custom content, even by players. In this forum, you will find information about how to create and use custom content. Anyone is allowed to post in this forum as they find any information that is useful.
Please remember that just because you can, doesn't mean you always should. Custom content always needs to be IC, and should never be a means to give your character an unfair advantage.
Custom Content
Re: Custom Content
The SE corner of the welcome center has a custom content creation tutorial. That area is also a sandbox so that you can create objects there. Please make new objects there, rather than in the IC areas of the server. This not only to avoid possible disruptions to RP, but it's also to make sure bits and pieces of new objects don't end up lost and spread throughout the server. (This has happened!)