Custom Cuix

Type cui command to load Custom User Interface
Go to Transfer tab and Create New Customization file, Save it on your prefered location
Now Go back to Customize tab, Find Partial Customization file in tree view, right click on it and choose load partial customization file
Load your Cuix File
Add New Command in Command List
Add New Panel, drag your command to this panel, Add new Tab and drag your panel to this tab
Save your cuix file, go back to all customization file, Drag your New Custom tab from Partial Customization to ACAD>Ribbon>Tabs and click ok
Now use cuiload command to unload your Custom cuix file and reload it again, you should able to see your custom tab on ribbon
If you bump into any problem refer this youtube Video