The Block Change form is displayed by the Block - Change Current tool. It lists all block inserts in the current layer and their base-point coordinates. There are several ways for you to select the required block insertion.
Block Change
Make Parent Current
If you choose this option, the block into which the current block insertion was added becomes the new current block. If the block insertion was drawn into the drawing layer, the drawing layer becomes the new current block.
Make Layer Current
If you choose this option, the current drawing layer becomes the new current block.
Identify Entity In Current
If you choose this option, you can select an entity from the project. After selecting the OK button, pick an entity in the usual way from the block insertion you wish to modify.
Make List Entry Current
Allows you to choose a block insertion from the list of block names and locations on the left. (Note that picking a block insertion from the list automatically selects this radio button option for you.)
Related topics: Blocks