Issue
You want to import a program from another instance, but the program's channel does not exist in the destination instance.
Solution
When you import a program, if the channel does not exist in the destination instance, it will be created by the import process.
For example:
Instance/Subscription A has a channel called Custom Channel 101, but Instance/Subscription B does not have that channel.
When you import a program from Instance A to B with that custom channel, the channel Custom Channel 101 will be created in Instance B.
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