What should I do about my TM30 registration when I travel between Bangkok and Phuket?

The individual will be working in Bangkok and staying in a hotel that will handle their registration. They have a registered address in Phuket and plan to return there on weekends. They inquire about necessary steps for TM30 registration when traveling between Bangkok and Phuket, particularly regarding their primary address. Responses indicate that their extension relates to Bangkok, and no additional actions are needed in Phuket unless they obtain an extension there.