To Change Properties of a Block Reference as You Insert It
Click
Window menu > Properties Inspector.
Click
Drafting tab > Block panel > Block.
In the Insert Block dialog box, in the Name box, select a name from a list of block definitions. Select Specify On-Screen to use the pointing device to specify one or more of the following:
Insertion Point
Scale
Rotation
Click OK.
In the Properties window, change the properties of the block (or dynamic block) reference.