Mark,
Thanks. But, I've tried to follow the tutorial "Create Your Own Collector Map" by Keith Mann to no avail using AcrGIS PRO. I can open a new folder, add a new geodatabase and even add a new point/polygon/line feature. But then the differences appear. If I select the new geodatabase and try adding domains to it, then I can't seem to do subtypes. Oh, I can add them in the Code and Description fields in the feature, but nothing appears in the catalog except the feature name. Then, how do I publish this map and the associated feature? The difference between ArcGIS Map and PRO and trying to create a Collector map is very, how should I say, blurry.