Good morning and welcome to the Community @hjm16,
You've come to the right place! A smartwatch plan gives you the freedom to stay connected with just your watch. Typically pairing and unpairing can resolve this issue for you. You can find the step by step instructions here.
Once you've successfully completed the unpair/pair, please let us know if you're still unable to view sharing plan options during the set up. You can do so by reaching out to us via PM @CommunityHelps. You can learn more about our PM system here.