Can I add 100 Phone Numbers to a Single Contact?
As far as I am aware there is no reference to wildcard characters in vcard.

If Mac OS or iOS supported such feature it would not be supported by other devices.

But you can add the 100 phone numbers by hand. I would recommend exporting the contact as a vcd file then add all the numbers by hand. Copy paste will be faster than writing them one by one in the Contacts app:

TEL;type=WORK;type=VOICE;type=pref:+43 664 6601301
TEL;type=WORK;type=VOICE;type=pref:+43 664 6601302
TEL;type=WORK;type=VOICE;type=pref:+43 664 6601303
...
TEL;type=WORK;type=VOICE;type=pref:+43 664 6601399


And import it back.