I am not sure if I am posting this in the correct category. We bought two CE Smart switches at Costco. We were thinking of using one of them to replace one three way switch. I have been reading about how to do this. It looks like I cannot connect this smart switch to a normal switch. I have noticed on line that you can buy an Add on switch to replace the second switch.
I have been unable to find any info as to whether or not CE Smart switches have add on ones available. Can you tell me if there is any brand of add on switch that will work with this Smart switch. Thank you for any help you can offer.
This forum is for people using the Samsung smartthings home automation platform, and those devices do not work with this platform, so I don’t think you’re going to get very many answers here. 
(this is a very active forum so it tends to come up near the top of general home automation searches, but it is specific to the Samsung SmartThings platform. )
Try the Reddit home automation subforum. It covers all brands. 
Thank you. I will try that.
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