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Hello @ppalmeraz!
You can absolutely remove your Fitbit Flex from your account if you're not going to use it. You can then re-pair it whenever it will be used. Additionally, you could sync your Surge to your account making sure that your Flex is not close to your mobile.
For general reference, if you need to set up your Fitbit, please follow these steps:
I hope you find this useful. If you have any questions feel free to let me know.
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