Mapping Classes and Layers

The Class and Layer Mapping command “maps” any set of layers and/or classes in a drawing into a new layer and/or class. The file structure can be simplified, condensed, and/or renamed. Use this feature, for example, when a consultant is using .DWG or .DXF files. Complex, multi-classed files imported from .DWG can be condensed or renamed, and empty classes deleted in a single operation. Mapping can be saved so the next time a file is received from that consultant, the file can be re-mapped in a single step. This same procedure can be revised for the process of providing files to consultants using a different file structure or drawing standard. See Managing Layers and Managing Classes.

To modify layers and classes:

1.	Select Tools > Class and Layer Mapping.

The Class Mapping dialog box opens. Modify the existing classes, and then click Go To Layers to open the Layer Mapping dialog box. The Layer Mapping dialog box is identical in layout to the Class Mapping dialog box.

Parameter	Description
Existing Classes/Layers	Lists the existing classes or layers in the file; layers or classes that are not moved to the Proposed or Merged list are deleted
Proposed Classes/Layers	Lists the proposed layers or classes to be created in the file; layers or classes that remain in this list are deleted when the layers and classes are modified
Add >	Adds a layer or class from the list of existing layers or classes to the Proposed list
Merge >	Adds a layer or class to the Merged list; layers or classes in this list will be merged with the layer or class that is selected in the Proposed list
< Remove	Removes the selected item from the Proposed list
New	Creates a new class or layer in the Proposed list
Rename	Renames the selected proposed layer or class
Merged Items	Lists layers or classes to merge with the selected layer or class in the Proposed list. The merge occurs when the next action is performed in the dialog box, so that layers and classes are merged on an ongoing basis. Selecting a proposed layer or class lists its merged items again so that changes can be made, if desired.
Remove	Removes the selected item from the Merged list
Load	Opens a previously saved mapping file
Save	Saves the layer or class mapping as a file; layer and class mapping settings are saved separately. This saves time when making the same modifications to several drawings that are set up similarly.
Reset All	Moves all proposed and merged items back to the Existing list
Delete empty class/layer in proposed drawing	Deletes all layers and classes that have no items associated with them
Go To Layers/Go To Classes	Toggles between the Class Mapping and Layer Mapping dialog boxes

When selecting existing and proposed classes and layers, press and hold the Shift key to select multiple, contiguous items or press and hold the Ctrl key (Windows) or Command key (Macintosh) to select non-contiguous items.

2.

Click OK.

The drawing is updated, using the new layer and class mapping. Layers and classes not moved to the Proposed or Merged list are deleted from the file, along with any objects in those layers or classes.