I don’t get what you mean. Command line interface and yet KDE, which is a desktop environment. Especially this
command line interface, for the benefit of other new users
makes me wonder.
An office-suite is not part of a default KDE install, openSUSE comes with LibreOffice, which is not part of KDE.
The installer at a certain moment arrives at a screen where a summary of chosen options is given (if automatic configuration is unchecked in a previous stage). You can then modify the software selection to be installed.
Another option is to use SUSE Studio, and create your own Live install medium, i.e. with a modified KDE install (no game packages etc.)
EDIT: I notice yours is your first post. Welcome !!