new playlist and name the track with the name of current playlist but with incremental numbering

Hi There
This is what I use for that, or at least for Duplicating Playlists. I f you want a New Playlist replace Duplicate in the menu path wth New

function doForAllSelectedTracks(action) {
    var originallySelectedTrackNames = sf.ui.proTools.selectedTrackNames;

    try {
        sf.ui.proTools.selectedTrackHeaders.forEach(track => {
            track.trackSelect();
            action(track);
        });
    }
    finally {
        sf.ui.proTools.trackSelectByName({ names: originallySelectedTrackNames });
    }
}

function trackFunc() {

    //Insert your code here
sf.ui.proTools.appActivateMainWindow();

if (!sf.ui.proTools.selectedTrack.normalizedTrackName.match(/\d+$/)) {
    sf.ui.proTools.selectedTrack.trackRename({
        renameFunction: n => n + ' t1',
    });
}

//Get the current track/playlist name
var oldPlaylistName = sf.ui.proTools.selectedTrackNames[0];

//Duplicate selected track playlist
sf.ui.proTools.selectedTrack.popupButtons.whoseTitle.is('Playlist selector').first.popupMenuSelect({
    menuPath: ["Duplicate..."],
});

//Wait for Duplicate Playlist window to appear
sf.ui.proTools.confirmationDialog.elementWaitFor({waitType: "Appear",});

//Click OK in Duplicate Playlist window
sf.ui.proTools.confirmationDialog.buttons.whoseTitle.is('OK').first.elementClick();

//Wait for Duplicate Playlist window to disappear
sf.ui.proTools.confirmationDialog.elementWaitFor({waitType: "Disappear",});

//Get and Increment Last Number
function getAndIncrementLastNumber(str) { 
    return str.replace(/\d+$/, function (s) {
        return ++s;
    });
}

//Variable for new clip name
var newPlaylistName = getAndIncrementLastNumber(oldPlaylistName);

//Rename Track with Old Name + Incrimented value
sf.ui.proTools.selectedTrack.trackRename({
    newName: newPlaylistName,
});
}

doForAllSelectedTracks(trackFunc);

Thanks Andrew!

I'm getting an error on line 35. Any ideas?

10.02.2022 18:27:05.05 [Backend]: Logging error in action (01) WaitForElementAction: Element was not found or removed after waiting 2000 ms

10.02.2022 18:27:05.61 [Backend]: !! Command Error: NEW PLAYLIST V+ [user:ck99zpoez000h6e10rjx8vg5g:ckzhsbddb0000bx102ob52qc3]:
Element was not found or removed after waiting 2000 ms (NEW PLAYLIST V+: Line 35)

<< Command: NEW PLAYLIST V+ [user:ck99zpoez000h6e10rjx8vg5g:ckzhsbddb0000bx102ob52qc3]

I am not getting any errors here.
The is a prefence in the editing tab in the tracks part 'Supress Name Dialog When Creating New Playlists' theis should be unticked.

yep - that fixed it. Thanks Andrew!