I was using Gmail and needed to organize something into a category (that would show on for Configuring my Inbox) which I wanted to make specifically for it. Although I noticed that it only allows me to configure my inbox with categories such as Social, Promotions, Updates, and Forums. Does anyone know how to make a brand new category and put it as a tab on my Gmail Inbox?
The categories are created by Google and not user defined. You can create labels and attach them to emails but what you're asking is not possible
One solution is to create labels, and then use multiple inboxes from the labs section of settings.
You can then have sections of your inbox that only show messages with that label.
This solution does allow you to control the logic used to assign the messages to the label. You can even manually assign messages if it is impossible to use a filter to do so.
On the left hand panel, you need to "Create a New Label" and add the name of what you would like your new category to be. Once you've done that, you can select the emails you would like and apply that label to them.