Changing macro to write to config specific prop

Hi folks,

I am not well versed in API/Macro, and I need some help converting a macro I found from codestack to write to a configuration specific property.

Macro can be found here: Macro to copy SOLIDWORKS custom property from material to model 

The specific section I am having difficulty is follows:

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Sub SetCustomProperty(model As SldWorks.ModelDoc2, prpName As String, prpVal As String)
    
    Dim swPrpMgr As SldWorks.CustomPropertyManager
    Set swPrpMgr = model.Extension.CustomPropertyManager("")
    swPrpMgr.Add3 prpName, swCustomInfoType_e.swCustomInfoText, prpVal, swCustomPropertyAddOption_e.swCustomPropertyReplaceValue
    swPrpMgr.Set2 prpName, prpVal
    
End Sub

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It works perfect to write to global properties, but I need this to write to configuration specific properties since I use configurations heavily.  I tried changing out CustomPropertyManager to ConfigurationManager, that did not do it.  I tired to set swPrpMgr to swConfigPrpMgr and other instances, but that did not do it either. 

So, my entry level api experience has come to ahead, and I need help. 

Kyle

SolidworksApi/macros