When creating a hosted feature layer in ArcGIS Online, the Create List option is unavailable when incorporating an .xlsx, form through the ArcGIS Maps extension in Microsoft Excel.

参考情報

対処法

1. In the ArcGIS Online hosted feature layer's item details page, click the Visualization tab, and map using a data feature other than Status.
2. Click Done, and click Save Layer.
3. Click the Data tab and click the Fields tab.
4. Then, go to Status and the Create List option will be present. 
5. Make all needed edits or addition to the Status column.
6. Go back to Visualization tab to see the symbology that is used to map the data.
7. Click the Overview tab of the hosted feature layer and click 'Open in Map Viewer Classic'.
8. Change the symbology to Status, and click Done
9. Click Save As to save a Map.
10. Go back to the item details page of the hosted feature layer.
11. Click the Data tab and click the Fields tab, go to the Status column and the Create List option is available.

However, this may be a bug based on the Define attribute lists and ranges documentation found at URL: https://doc.arcgis.com/en/arcgis-online/manage-data/define-attribute-lists-and-ranges.htm

In the last bulleted statement, it states that “If you create a list for a field to which you have applied the Types (Unique Symbols) style, be sure the values in your list are the same as the unique values defined for your editing templates.”  

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