I have several county maps. Each map has 19 layers of data plus a few regions. The 19 data layers are arranged in the same order and include the same fields on each of the maps. The data in these layers is restricted to the county. I'd like to be able to combine maps covering adjacent counties into a single map. I could do this in ArcGIS Online by saving each layer from one map and then adding all the layers to the other map. This would require roughly 40 steps. (The raw data is still handy, but each layer has several adjustments to the symbology so 40 steps per join would be faster than recreating the maps from scratch if the final map is to have less than 5 or 6 counties.) Is there a better way?