Попробуй
Dim pEditor As IEditor
Dim pID As New UID
Dim pDataset As IDataset
pID = "esriEditor.Editor"
Set pEditor = Application.FindExtensionByCLSID(pID)
Set pDataset = pFeatLayer.FeatureClass
pEditor.StartEditing pDataset.Workspace
pEditor.StartOperation
//здесь сам процесс редактирования
pEditor.StopOperation "название операции"
pEditor.StopEditing
True