Problem

 How can I add a new Catalog Instance to the Place Wall dialog which currently shows categories of walls such as Schematic, Wall, Partition, Shaft, Chase, Furring, CurtainWall and Wall Component?

Solution

 You need to edit two different xml files with the new Catalog Instance name.

C:\Program Files (x86)\Bentley\AECOsimBuildingDesigner V8i\AECOsimBuildingDesigner\datagroupsystem\Wall_Common_enumlookups.xml
- add a new definition under <EnumLookup definition="Wall_Common" property="Wall_Common/@Type" extendable="false">

C:\ProgramData\Bentley\AECOsimBuildingDesigner V8i\WorkSpace\BuildingDatasets\Dataset_US\setting\WallFilterHierarchy.xml
- add the new Catalog Instance name under Node Name and again in Test sections in the file.