Jterry,
The best way is to modify the SWBrowser.mdb database. Make a backup of this file first, just in case.
Open it up and look for the AM_DATA_HW_TappedHole table. This is where the Hole Wizard gets the Metric tapped hole information from. Add a new entry for your M14x1. You also have to add the tap drill size. Open the AM_DATA_HW_TapDrills table and add a new entry. Keep the SIZE description the same for both. And finally look for AM_DATA_THRD and add any entry. This is where you put all the information in about the threads. Make sure you use the same size description everywhere.
I have modified this database extensively for our company standards. It’s no big deal. Mostly it is just hard to find what you need to change. Good luck.
Chris