Create a new BlockTableRecord , give it a name, and append your geometric entities (like Line or Circle ) to it.

to manage blocks is one of the most powerful ways to do it. Whether you're building a custom part library or batch-updating thousands of drawings, programmatic block management saves hours of manual clicking.

Mira called it the Net because, when you ran -BLOCK and listed dependencies, it looked like a conspiracy web. DOOR-12 contained HANDLE-L and HINGE-2 , but HINGE-2 was actually a nested block from an architect who left in 2019, and that block contained a single stray point at 0,0 and a text entity that just said "why."

For those looking to dive deeper into programming:

The Autodesk Help System provides detailed guides on defining blocks using managed code.

You can scan thousands of drawings to update a specific block definition or count instances for an audit program .