Hello Cory Martin,
We currently do not have functionality to merge Channels together.
What you could do is move all of the content from your Sales:IN, Sales:MI, and SAles:CA Channels into one by using the move content functionality. Please see our article here: https://customercare.igloosoftware.com/support/knowledgebase/all_articles/articles/moving_published_content
I do want to highlight the part of the article that indicates that moving content will create notifications for people following the articles being moved and those following the destination Channel.
Please let me know if you have any further questions.