Trying to store saved components. Finder>Hard-drive>User>Username>Library>Application Support> (SketchUp should be here.) How do I add SketchUp to my application support?
Normally that’s a hidden directory. No need to add it as it already exists. You would need to show hidden folders in Finder to find that.
Alternatively you could drag open or create a local collection in the Components panel, open the secondary pane and then drag and drop in model component thumbnails into that collection.
In the SketchUp menu, Preferences (which is named Settings in macOS Ventura), Files, you can see the location of the various types of documents. Click on the folder icon next to the Components entry, and that folder will be opened in Finder.