Draw – block – make. Select objeckter, you see the picture in the small square of the selected objects. Even being block. It is important to name the block smart to find it later.
It is best to choose the base point and insert it. Bottom left is a good idea.
Tools pallets design center open drawing-block. command adCenter. Inside the blocks will be able to see all the blocks that are made in the drawing you are in.
To modify an existing block takes the x explode, the block, make changes, create a new block of the new settings, save them by the same name as the last time. Then you will be notified and redefine Blocken this would you. If you create a new file and enter the block, it will have a separate block. If you change the file in it will not change anything in the old.