I'm trying to setup a feature service with multiple CAD datasets. We're mapping housing developments and as a new stages are developed/changed/approved, we'd like to be able to import new data into a feature service without compromising the existing data. As we assign values to the objectID's of the polygons in the shapefile manually through the website's CMS, when we need to update/republish new datasets, the polygon ID's change each time (as they seem to be assigned randomly) which renders our objectID 'tagging' irrelevant. If there is a way to add/remove CAD data on an existing feature service without re-assigning the shapefile's objectID's this would help cut down our mapping time considerably. Any tutorials or links would be much appreciated.