Using the Write Block (WBLOCK) command to create a new drawing a CAD designer needs...

 Open the WBLOCK Command: Type WBLOCK in the command line and press Enter.

 Define the Block: Select the objects you want to include in the block.

 Specify the Base Point: Select the base point for the block insertion.

 Insert Units: Ensure to set the Insert Units option to match the desired unit for automatic scaling when the block is inserted into other drawings. This setting will control how the block is scaled based on the units of the target drawing.

References:

AutoCAD Help Documentation on Write Block (WBLOCK) command