Depending on whether or not your SmartApp created the device-type (Tile), which could be one of many types, then the answer is Yes - a parent smartApp can create/remove childApps and childDevices as often as desired - childApps show up in which ever category they are “coded” into and the device-types show up in “things” (things that have Tiles)… In either case the smartApp and device-type have to be published and in the same name space to be created/deleted… So in a certain sense you could do “dynamic” “things” that have data specific formats and “dynamic apps” by creating them as childApps…