Converts selected entities and identical instances into blocks.
BCONVERT (Command): Select object to find matching instances to convert to blocks

The following options are displayed.
Provides option to select and review instances selected for block conversion. It also displays the number of total instances.
Specifies whether to convert blocks in the current drawing and geometry containing blocks or only the source object.
Temporarily closes the dialog box so that you can review the selected instances for block conversion within the current drawing.
Provides option to choose whether to convert selected instances into an existing block or create a new block.
). Temporarily closes the dialog box so that you can specify a block from the current drawing that you want to convert the selected instances into.
Provides option to select a layer to assign the block to.