When a block is inserted, a block reference is created and its location, scale and rotation is specified by the user.
It is possible to specify the scale of a block reference using different X and Y values. Inserting a block creates an object called a block reference because it referees to a block definition stored in the current drawing.
If you insert a block that uses different drawing units than the units specified for the drawing, the block is automatically scaled by a factor equivalent to the ratio between the two units.
It
is possible to insert one or more block definitions from an existing drawing file
into your current drawing file, using
the menu Insert Block
from a Part Library, or using the command INSERT_PART
It is possible to insert one or more block definitions using the menu Insert Blocks
manager or
using the command BLOCKS
Also see:
How to insert a block from a Parts library
How to insert a block from an other drawing