A code plug is just a fancy name for a programming file the is loaded into the radio containing all the frequencies and settings, channels names etc
Below are screen shots of a typical code plug using the CPS software "CPS" stands for Computer or Customer Programming Software
This is the most time consuming and redundant part of programming DMR radios

Click on the image to zone in

Below examples of code plug creation using the CPS sotyware
 












Below are the details of the configuration including optional settings and parameters Note: Your radio may look different
 





  

Importing and exporting the code plug CSV files is the fastest and easiest way to modify the plug




I highly recommend you read the DMR radios manual and get an understanding of how each of these options effects your DMR experience