Using ArcMap 10.8.1. When selecting a feature to add, the Table of Contents feature tab lists the features that may be added. For features that have multiple subtypes, the listing for the feature can be expanded to display a list of subtypes so that an individual subtype can be selected. The question is: Can the list of subtypes be filtered to only show a subset of subtypes is displayed? For example, there is a Manhole feature that has 4 Manhole, 9 Service Box and 4 Vault subtypes. Would like to restrict the list so that only the 4 Manhole subtypes are available. Thanks for any suggestions.
It sounds like you are looking at the layer symbology in the TOC which shows the symbology of layers already added to the map as well as a box to toggle on/off.
I believe you are looking to set a Definition Query in the Layer Properties ( SubTypeField = 'Manhole') for that layer to restrict what is being drawn.
R_