Highlighting non-contiguous words/phrases so a paragraph style can be assigned in one click

Again, could be scripted. In fact, my guess is that even ChatGPT or any other AI could write it for you. Here's a quick one from Co-Pilot. I strongly suggest saving the document first and running it on a copy.

I'd be curious to know how you make out with it.

// InDesign Script: Convert Manual Overrides to Styles
if (app.documents.length > 0) {
    var doc = app.activeDocument;

    // Function to apply character styles
    function applyCharacterStyles() {
        var allTextFrames = doc.textFrames;
        for (var i = 0; i < allTextFrames.length; i++) {
            var textFrame = allTextFrames[i];
            var text = textFrame.texts[0];

            // Loop through each character
            for (var j = 0; j < text.characters.length; j++) {
                var char = text.characters[j];
                if (char.appliedCharacterStyle == doc.characterStyles[0]) { // Default style
                    var newStyle = findOrCreateCharacterStyle(char);
                    char.appliedCharacterStyle = newStyle;
                }
            }
        }
    }

    // Function to apply paragraph styles
    function applyParagraphStyles() {
        var allParagraphs = doc.stories.everyItem().paragraphs.everyItem().getElements();
        for (var i = 0; i < allParagraphs.length; i++) {
            var para = allParagraphs[i];
            if (para.appliedParagraphStyle == doc.paragraphStyles[0]) { // Default style
                var newStyle = findOrCreateParagraphStyle(para);
                para.appliedParagraphStyle = newStyle;
            }
        }
    }

    // Helper: Create or find a character style based on formatting
    function findOrCreateCharacterStyle(char) {
        var styleName = "CharStyle_" + char.fontStyle + "_" + char.pointSize;
        var existingStyle = doc.characterStyles.itemByName(styleName);
        if (!existingStyle.isValid) {
            var newStyle = doc.characterStyles.add({ name: styleName });
            newStyle.fontStyle = char.fontStyle;
            newStyle.pointSize = char.pointSize;
            return newStyle;
        }
        return existingStyle;
    }

    // Helper: Create or find a paragraph style based on formatting
    function findOrCreateParagraphStyle(para) {
        var styleName = "ParaStyle_" + para.justification + "_" + para.pointSize;
        var existingStyle = doc.paragraphStyles.itemByName(styleName);
        if (!existingStyle.isValid) {
            var newStyle = doc.paragraphStyles.add({ name: styleName });
            newStyle.justification = para.justification;
            newStyle.pointSize = para.pointSize;
            return newStyle;
        }
        return existingStyle;
    }

    // Run the functions
    applyCharacterStyles();
    applyParagraphStyles();

    alert("Manual overrides have been converted to styles!");
} else {
    alert("No document is open. Please open a document and try again.");
}