The software provides two commands for creating a new volume object out of existing
volumes: Merge Volumes Command 
and Bound by Volumes Command 
. Both commands allow you to select two or more existing volumes and join them to form
a new volume.
Creating Volumes from Merging Volumes
You can create a volume that is the union of two or more volumes using Merge Volumes Command . The existing volumes are consumed in the merge operation; consequently, the sub-volumes
are no longer available as separate entities. The software removes them from the graphic
views and groups them under the merged volume in the Workspace Explorer.
The resulting 3-D volume type is, by default, the same type as the last type used; however, you can change this type if necessary. The resulting volume inherits the properties of the first volume that you select for the merge.
You can only select the sub-volumes grouped under the merge from the Workspace Explorer. Sub-volumes used to create a merged volume have no value on their own and are used solely to create geometric shapes that otherwise could not be created. Deleting a merged volume deletes all of the sub-volumes associated with it.
Creating Volumes Bound by Other Volumes
You can also create a volume from existing volumes using Bound by Volumes Command . The existing volumes remain graphically in the view and in the Workspace Explorer.
The sub-volumes that are selected to create the new volume can be selected graphically or from the Workspace Explorer. Deleting the new volume deletes the individual integrity of the sub-volumes but does not delete the sub- volumes.
After creating a volume using Merge Volumes Command or Bound by Volumes Command , you can modify the volume properties, such as location. If you modify the status
or permission group of the resulting volume, then the change is propagated to the
sub- volumes, as shown in the following illustration:
In this example, Volume 1 and Volume 2 have a status of Working and belong to permission group A. Their union volume is created with a status of Approved and assigned to permission group B. The approved status and permission group B are propagated back to Volumes 1 and 2.
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