cati has some Editable Text Configurations (/etc/cati directory).
you can edit them with your editor.
cati checks package architecture while installing that. for example, cati does not installs amd64 package on i386 system. cati only installs packages with all and your system architecture. also you can add another allowed architectures. you can add them in /etc/cati/allowed-architectures.list file. as default, this file is empty.
but you can add another files like this syntax:
amd64
i386
...
you have to write archs line by line.