When adding custom properties to a component in the schematic, this property name gets added to a global table in the schematic. Over time, this table becomes full of cruft and duplicates. A means to edit this table of names and possible values would be useful. In addition, often duplicate names/labels get added. Without a means to delete these duplicates causes problems when creating the BOM. In addition to being able to delete names/labels/tags, there needs to be an option to combine two properties. For example, there are two similar properties - 'Manufacturer PN' and 'Manu. #'. Some components use the first property, and others use the second. They are both the same property, so a means to combine both into a common property is needed to solve this problem. Without this ability, when exporting the BOM, one ends up with two columns, both meaning the same thing.