Helps you save selected layer comps as a single psd file.

Photoshop - Selected Layer Comps to PSD

/*

Author: https://github.com/joonaspaakko
Gist: https://gist.github.com/joonaspaakko/09e8e2a218038e15344d

<javascriptresource>
<name>Menu=Selected Layer Comps to PSD...</name>
<category>layercomps</category>
</javascriptresource>

*/

// enable double clicking from the Macintosh Finder or the Windows Explorer
#target photoshop

try  {

    var save, cancel, dlg, tempkeep;

    // If documents exist, do stuff...
    if ( app.documents.length > 0 ) main();

    function main() {

        // Currently active document...
        var doc = app.activeDocument;

        // Document has been saved...
        try {

            var docPath = Folder( doc.fullName.parent ).fsName;
            var docName = decodeURI( doc.fullName.name.substring( 0, app.activeDocument.fullName.name.indexOf(".") ) );

        }
        // Document has not been saved...
        catch( e ) {

            var docPath = "";
            var docName = doc.name;

        }

        // THIS IS WHERE DECISIONS ARE MADE!?!?!?!?!?
        dialog( doc, docName, docPath );

        if ( !cancel ) {

            // Duplicate current document
            var tempDoc = doc.duplicate();

            // Get layer comps
            var layerComps = tempDoc.layerComps;

            var shredder = [];

            // Loop through each comp...
            for ( i = 0; i < layerComps.length; i++ ) {

                // Each looped comp
                var comp = layerComps[ i ];

                // If comp is not selected...
                if ( !comp.selected ) {

                    // ...push it to shredder
                    shredder.push( comp );

                }

            }

            // Loop through each shreddable comp...
            for ( i = 0; i < shredder.length; i++ ) {

                // Each looped comp
                var comp = shredder[ i ];

                // Shred it
                comp.remove();

            }

            // Save temporary document as a psd file.
            if ( save ) savePSD( doc, docName, docPath, tempDoc);

            // Close temporary document.
            tempDoc.close( SaveOptions.DONOTSAVECHANGES );

            // If user checks the checkbox "Keep new file open",
            // this part of the code actually opens up the file again...
            if ( dlg.export.tempkeep.value ) {

                // Find the file we just saved...
                var savedFile = new File( dlg.destination.input.text + '/' + dlg.filename.input.text + '.psd' );

                // ...open it
                app.open( savedFile );

            }

        }
    }
} catch ( e ) {}

function dialog( doc, docName, docPath, tempDoc ) {

    // Prepare dialog...
    var dialog = "dialog {  \
        text: 'Export selected layer comps as PSD', \
        destination: Panel { \
            alignment: 'left', \
            alignChildren:['left','top'], \
            orientation: 'row', \
            text: 'File destination', \
            input: EditText { text: '"+ docPath +"/', preferredSize: [230,20] }, \
            browse: Button { text: 'Browse...' }, \
        }, \
        filename: Panel { \
            alignment: 'left', \
            alignChildren:['left','top'], \
            orientation: 'row', \
            text: 'Filename', \
            input: EditText { text: '"+ docName +"', active: true, preferredSize: [320,20] }, \
        }, \
        export: Group { \
            alignment: 'right', \
            orientation: 'row', \
            tempkeep: Checkbox { text: 'Keep new file open', value: false }, \
            save: Button { text: 'Save', properties:{ name: 'ok' } }, \
            cancel: Button { text: 'Cancel' }, \
        } \
    }";

    // Make dialog
    dlg = new Window( dialog );

    // Browse click event...
    dlg.destination.browse.onClick = function() {

        // Browse for destination
        destination = Folder.selectDialog("Select destination", docPath );

        // If destination was selected above...
        if ( destination != null ) {
            // Update input path
            dlg.destination.input.text = destination.fsName;
        }

    }

    dlg.export.save.onClick = function() {

       save = true;
       dlg.close();

    }

    dlg.export.cancel.onClick = function() {

        cancel = true;
        dlg.close();

    }

    // Show dialog
    dlg.show();


}

function savePSD( doc, docName, docPath, tempDoc ) {

    // Options for the psd file
    var psd_Opt = new PhotoshopSaveOptions();

    psd_Opt.layers = true; // Keep layers

    // Save active document to the selected destination
    tempDoc.saveAs( File( dlg.destination.input.text + '/' + dlg.filename.input.text + '.psd' ), psd_Opt, true );

    app.beep();

}