How to add rar to a custum command?

Hi

i would like to have rar on the custom commands.

In SSH the command is like that: rar a -v100000k -m0 filename.rar input

I dont,t know how to write it on an cistom command. The name should like the folder.

Thank you

Take a tar/gzip command as example:
tar -cz -f "!?&Archive Name:?archive.tgz!" !&