I already have a pin set up and is required if I want to add new channel. But is there a way to require the pin to view a specific channel that is already on my list. So for example only allowing the kids to watch that specific channel when I want them to.
No.
You may want to submit that on the Suggest a Feature page.
DBDukes
Roku Community Streaming Expert
Note: I am not a Roku employee.
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One workaround is to have separate Roku accounts and then you can put a separate set of channels on each with the PIN so that additional channels can't be added. The drawback is that if you subscribe to anything through Roku (not recommended) you'd either have to subscribe to things twice or your subscription would only be available on devices linked to the one account