The section Key Concepts When Using Containers with COBOL Applications outlines the different ways in which you can use containers with your COBOL applications and introduces the recommendation of first creating base images for Enterprise Server, then using those base images to create additional images that also include your applications.
This section outlines the steps you need to perform when creating these images.
Once you are familiar with the steps described in this section you should look at the container demonstrations supplied with Enterprise Server. These demonstrations include all the files that are needed to create example images for use with Enterprise Server, and the section Container Demonstrations contains detailed descriptions of the files contained in some of the demonstrations.
After reading this section and Container Demonstrations you should be able to create your own images for use with your COBOL applications.