Select Blocks
Select the blocks on which you want to apply the rules. Only blocks are selectable.
Any blocks that you selected before running Auto Assembly 
are added to the select set that results from this step. Any other selected items
are discarded from the select set.
Finish
Executes the command and commits the changes to the database. The software applies the rules to the selected blocks individually. If you select a non leaf-level block, the software applies the rules to that block and excludes any sub-blocks and their content.
Cancel
Discards the select set so that you can start over.
Apply rule
Specifies the automatic assembly creation rule to apply to the select set. The software populates the list with data as defined in the Planning reference data. The following default rules are delivered:
To
Controls the items on which the software imposes the rules. You can select All Parts or Unprocessed Parts. For blocks that are not leaf blocks, the software skips any content of block children.