I'd like to add or update a "Description" custom property with other existing custom properties.  If I were doing it manually I'd populate the "Descriptoin" prop with the following:

\$PRP:"GenericDescription" \$PRP:"ConfigDescription"

I was thinking something along the lines of this but I can't figure out how to get the above information in the program.

*Note this is part of a routine that would traverse an assembly

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Function updateProperty(swModel As SldWorks.ModelDoc2) As Boolean
Dim cpm As CustomPropertyManager

Dim path As String, filename As String, Description As String, DescVal As String

Set cpm = swModel.Extension.CustomPropertyManager("")
Set DescVal=\$PRP:"GenericDescription" \$PRP:"ConfigDescription"

cpm.Delete "Description"
cpm.Add2 "Description", swCustomInfoText, "\$PRP:"GenericDescription" \$PRP:"ConfigDescription"

End Function