So you have 10 ads, and want to play 5 of them + station id? For this you should use Playlist Geenrator Pro.
Create 2 categories:
1. Station ID, set the duration = 1 track, select the source (one file or a folder, playlist, depending on your situation). In case of folder (or other source with more than one track) it will select one random station ID.
2. ADs: set duration = 5 tracks, select the folder where you have the ADs.
Add both categories to the playlist structure and save a preset.
Create a scheduler event, click the wizard icon (lighting bolt), select "Perform an action", on the next step select "Generate playlist" and select the preset you've saved.
When event launches, it will select 1 station ID, 5 ads, and put all those 6 tracks to the playlist.