Applies to  SUSE Linux Enterprise Server 15 SP3
15 Customizing installation images manually #
    You can customize the standard SUSE Linux Enterprise installation images by editing a file
    in the installation ISO image, media.1/products.
    Add modules and extensions to create a single customized installation image.
    Then copy your custom image to a CD, DVD, or USB flash drive to create a
    customized bootable installation medium. See 
    the SUSE Best Practices paper on How to Create a Custom
    Installation Medium for SUSE Linux Enterprise 15 for
    complete instructions.